diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 7b06c6ab5..9d6032298 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,6 +1,6 @@
 ## Validator Changes
 
-* no changes
+* Fix issues with multiple terminology servers (should be live soon)
 
 ## Other code changes
 
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java
index 5383153cc..0b1a5766d 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java
@@ -231,7 +231,7 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
   private Object lock = new Object(); // used as a lock for the data that follows
   protected String version; // although the internal resources are all R5, the version of FHIR they describe may not be 
 
-  protected TerminologyClientManager terminologyClientManager = new TerminologyClientManager(new TerminologyClientR5Factory());
+  protected TerminologyClientManager terminologyClientManager = new TerminologyClientManager(null);
   private boolean minimalMemory = false;
 
   private Map<String, Map<String, ResourceProxy>> allResourcesById = new HashMap<String, Map<String, ResourceProxy>>();
@@ -850,6 +850,9 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
     }
     Set<String> systems = findRelevantSystems(vs);
     TerminologyClientContext tc = terminologyClientManager.chooseServer(systems, true);
+    if (tc == null) {
+      res = new ValueSetExpansionOutcome("No server available", TerminologyServiceErrorClass.INTERNAL_ERROR, true);      
+    }
     Parameters p = constructParameters(tc, vs, hierarchical);
     for (ConceptSetComponent incl : vs.getCompose().getInclude()) {
       codeSystemsUsed.add(incl.getSystem());
@@ -1885,8 +1888,9 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
     return expParameters;
   }
 
-  public void setExpansionProfile(Parameters expParameters) {
+  public void setExpansionParameters(Parameters expParameters) {
     this.expParameters = expParameters;
+    this.terminologyClientManager.setExpansionParameters(expParameters);
   }
 
   @Override
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/IWorkerContext.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/IWorkerContext.java
index 04c666fb9..20440466f 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/IWorkerContext.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/IWorkerContext.java
@@ -284,7 +284,7 @@ public interface IWorkerContext {
    * 
    * Note that the Validation Options override these when they are specified on validateCode
    */
-  public void setExpansionProfile(Parameters expParameters);
+  public void setExpansionParameters(Parameters expParameters);
 
   // these are the terminology services used internally by the tools
   /**
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/SimpleWorkerContext.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/SimpleWorkerContext.java
index 1498e416e..b21913ff5 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/SimpleWorkerContext.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/SimpleWorkerContext.java
@@ -535,7 +535,7 @@ public class SimpleWorkerContext extends BaseWorkerContext implements IWorkerCon
 	      version = "5.0.0";
 	    }
 	  }
-	  if (loader != null) {
+	  if (loader != null && terminologyClientManager.getFactory() == null) {
 	    terminologyClientManager.setFactory(loader.txFactory());
 	  }
 	  return t;
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/Parameters.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/Parameters.java
index d9ae0ad06..145f39ad0 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/Parameters.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/Parameters.java
@@ -1512,7 +1512,14 @@ public String toString() {
     }
     return s;
   }
+  
+  
+  public boolean hasValuePrimitive() {
+    return hasValue() && getValue() instanceof PrimitiveType<?>;
+  }
+
 // end addition
+
   }
 
     /**
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/terminologies/client/TerminologyClientManager.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/terminologies/client/TerminologyClientManager.java
index 56ff5c0d5..6e77f5977 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/terminologies/client/TerminologyClientManager.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/terminologies/client/TerminologyClientManager.java
@@ -2,7 +2,9 @@ package org.hl7.fhir.r5.terminologies.client;
 
 import java.io.File;
 import java.io.IOException;
+import java.net.MalformedURLException;
 import java.net.URISyntaxException;
+import java.net.URL;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -11,6 +13,8 @@ import java.util.Map;
 import java.util.Set;
 
 import org.hl7.fhir.exceptions.TerminologyServiceException;
+import org.hl7.fhir.r5.model.Parameters;
+import org.hl7.fhir.r5.model.Parameters.ParametersParameterComponent;
 import org.hl7.fhir.r5.model.TerminologyCapabilities;
 import org.hl7.fhir.r5.terminologies.utilities.TerminologyCache;
 import org.hl7.fhir.utilities.ToolingClientLogger;
@@ -37,10 +41,12 @@ public class TerminologyClientManager {
   private Map<String, TerminologyClientContext> serverMap = new HashMap<>(); // clients by server address
   private Map<String, String> resMap = new HashMap<>(); // client resolution list
   private List<String> internalErrors = new ArrayList<>();
+  protected Parameters expParameters;
 
   private TerminologyCache cache;
 
   private File cacheFile;
+  private String usage;
 
   private String monitorServiceURL;
 
@@ -65,7 +71,6 @@ public class TerminologyClientManager {
     this.isTxCaching = isTxCaching;
   }
   
-  
   public void copy(TerminologyClientManager other) {
     cacheId = other.cacheId;  
     isTxCaching = other.isTxCaching;
@@ -74,6 +79,7 @@ public class TerminologyClientManager {
     resMap.putAll(other.resMap);
     monitorServiceURL = other.monitorServiceURL;
     factory = other.factory;
+    usage = other.usage;
   }
 
   public boolean usingCache() {
@@ -105,6 +111,13 @@ public class TerminologyClientManager {
     String server = resMap.get(s);
     if (server == null) {
       server = decideWhichServer(s);
+      // testing support
+      if (server != null && server.contains("://tx.fhir.org")) {
+        try {
+          server = server.replace("tx.fhir.org", new URL(getMasterClient().getAddress()).getHost());
+        } catch (MalformedURLException e) {
+        }
+      }
       resMap.put(s, server);
       save();
     }
@@ -123,7 +136,27 @@ public class TerminologyClientManager {
   }
 
   private String decideWhichServer(String url) {
+    if (expParameters != null) {
+      if (!url.contains("|")) {
+        // the client hasn''t specified an explicit version, but the expansion parameters might
+        for (ParametersParameterComponent p : expParameters.getParameter()) {
+          if (Utilities.existsInList(p.getName(), "system-version", "force-system-version") && p.hasValuePrimitive() && p.getValue().primitiveValue().startsWith(url+"|")) {
+            url = p.getValue().primitiveValue();
+          }
+        }
+      } else {
+        // the expansion parameters might override the version
+        for (ParametersParameterComponent p : expParameters.getParameter()) {
+          if (Utilities.existsInList(p.getName(), "force-system-version") && p.hasValueCanonicalType() && p.getValue().primitiveValue().startsWith(url+"|")) {
+            url = p.getValue().primitiveValue();
+          }
+        }
+      }
+    }
     String request = Utilities.pathURL(monitorServiceURL, "resolve?fhirVersion="+factory.getVersion()+"&url="+url);
+    if (usage != null) {
+      request = request + "&usage="+usage;
+    } 
     try {
       JsonObject json = JsonParser.parseObjectFromUrl(request);
       for (JsonObject item : json.getJsonObjects("authoritative")) {
@@ -209,6 +242,7 @@ public class TerminologyClientManager {
 
   public void setFactory(ITerminologyClientFactory factory) {
     this.factory = factory;    
+    System.out.println("tcc factory version = "+factory.getVersion());
   }
 
   public void setCache(TerminologyCache cache) {
@@ -263,5 +297,21 @@ public class TerminologyClientManager {
   }
 
   
-  
+
+  public Parameters getExpansionParameters() {
+    return expParameters;
+  }
+
+  public void setExpansionParameters(Parameters expParameters) {
+    this.expParameters = expParameters;
+  }
+
+  public String getUsage() {
+    return usage;
+  }
+
+  public void setUsage(String usage) {
+    this.usage = usage;
+  }
+
 }
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/test/utils/TestingUtilities.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/test/utils/TestingUtilities.java
index 43b7c9f03..0c99acc42 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/test/utils/TestingUtilities.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/test/utils/TestingUtilities.java
@@ -86,7 +86,7 @@ public class TestingUtilities extends BaseTestingUtilities {
         fcontext = getWorkerContext(pcm.loadPackage(VersionUtilities.packageForVersion(version), version));
       }
       fcontext.setUcumService(new UcumEssenceService(TestingUtilities.loadTestResourceStream("ucum", "ucum-essence.xml")));
-      fcontext.setExpansionProfile(new Parameters());
+      fcontext.setExpansionParameters(new Parameters());
       if (!fcontext.hasPackage("hl7.terminology.r5", null)) {
         NpmPackage utg = pcm.loadPackage("hl7.terminology.r5");
         System.out.println("Loading THO: "+utg.name()+"#"+utg.version());
diff --git a/org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/context/SimpleWorkerContextTests.java b/org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/context/SimpleWorkerContextTests.java
index a3c4afa60..509ca89bb 100644
--- a/org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/context/SimpleWorkerContextTests.java
+++ b/org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/context/SimpleWorkerContextTests.java
@@ -1,6 +1,8 @@
 package org.hl7.fhir.r5.context;
 
 import static org.junit.jupiter.api.Assertions.*;
+import org.hl7.fhir.r5.terminologies.client.TerminologyClientR5.TerminologyClientR5Factory;
+
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyBoolean;
 import static org.mockito.ArgumentMatchers.argThat;
@@ -432,7 +434,7 @@ public class SimpleWorkerContextTests {
     Mockito.doReturn(terminologyCapabilities).when(terminologyCache).getTerminologyCapabilities();
     Mockito.doReturn(capabilitiesStatement).when(terminologyCache).getCapabilityStatement();
 
-    String actual = context.connectToTSServer(null, terminologyClient, null);
+    String actual = context.connectToTSServer(new TerminologyClientR5Factory(), terminologyClient, null);
 
     assertEquals("dummyVersion", actual);
 
@@ -454,7 +456,7 @@ public class SimpleWorkerContextTests {
     Mockito.doReturn(terminologyCapabilities).when(terminologyClient).getTerminologyCapabilities();
     Mockito.doReturn(capabilitiesStatement).when(terminologyClient).getCapabilitiesStatementQuick();
 
-    String actual = context.connectToTSServer(null, terminologyClient, null);
+    String actual = context.connectToTSServer(new TerminologyClientR5Factory(), terminologyClient, null);
 
     assertEquals("dummyVersion", actual);
 
diff --git a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/ValidationEngine.java b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/ValidationEngine.java
index 05b81a143..84f43d39f 100644
--- a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/ValidationEngine.java
+++ b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/ValidationEngine.java
@@ -477,7 +477,7 @@ public class ValidationEngine implements IValidatorResourceFetcher, IValidationP
     context.setCanNoTS(true);
     context.setCacheId(UUID.randomUUID().toString());
     context.setAllowLoadingDuplicates(true); // because of Forge
-    context.setExpansionProfile(makeExpProfile());
+    context.setExpansionParameters(makeExpProfile());
     if (tt != null) {
       context.setClock(tt);
     }
@@ -841,6 +841,7 @@ public class ValidationEngine implements IValidatorResourceFetcher, IValidationP
 
   public InstanceValidator getValidator(FhirFormat format) throws FHIRException, IOException {
     InstanceValidator validator = new InstanceValidator(context, null, null);
+    context.getTxClientManager().setUsage("validation");
     validator.setHintAboutNonMustSupport(hintAboutNonMustSupport);
     validator.setAnyExtensionsAllowed(anyExtensionsAllowed);
     validator.getExtensionDomains().clear();
diff --git a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/special/R4R5MapTester.java b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/special/R4R5MapTester.java
index 35d9e1ad8..dfecae980 100644
--- a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/special/R4R5MapTester.java
+++ b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/special/R4R5MapTester.java
@@ -196,7 +196,7 @@ public class R4R5MapTester implements IValidatorResourceFetcher {
     validator.setDebug(false);
     validator.setForPublication(true);
     validator.setNoTerminologyChecks(true);
-    context.setExpansionProfile(new Parameters());
+    context.setExpansionParameters(new Parameters());
     
     log("Load R4 Examples");
     NpmPackage r4Examples = pcm.loadPackage("hl7.fhir.r4.examples");
diff --git a/org.hl7.fhir.validation/src/test/java/org/hl7/fhir/conversion/tests/UtilitiesXTests.java b/org.hl7.fhir.validation/src/test/java/org/hl7/fhir/conversion/tests/UtilitiesXTests.java
index 9f168dc71..c91fa947a 100644
--- a/org.hl7.fhir.validation/src/test/java/org/hl7/fhir/conversion/tests/UtilitiesXTests.java
+++ b/org.hl7.fhir.validation/src/test/java/org/hl7/fhir/conversion/tests/UtilitiesXTests.java
@@ -90,7 +90,7 @@ public class UtilitiesXTests {
 	      pcm = new FilesystemPackageCacheManager.Builder().build();
 	      IWorkerContext fcontext = TestingUtilities.getWorkerContext(pcm.loadPackage(VersionUtilities.packageForVersion(version), version), loaderForVersion(version));
 	      fcontext.setUcumService(new UcumEssenceService(UtilitiesXTests.loadTestResourceStream("ucum", "ucum-essence.xml")));
-	      fcontext.setExpansionProfile(new Parameters());
+	      fcontext.setExpansionParameters(new Parameters());
 	      fcontexts.put(version, fcontext);
 	    } catch (Exception e) {
 	      throw new Error(e);
diff --git a/org.hl7.fhir.validation/src/test/java/org/hl7/fhir/terminology/tests/TerminologyServiceTests.java b/org.hl7.fhir.validation/src/test/java/org/hl7/fhir/terminology/tests/TerminologyServiceTests.java
index 77757fafe..d924f6a16 100644
--- a/org.hl7.fhir.validation/src/test/java/org/hl7/fhir/terminology/tests/TerminologyServiceTests.java
+++ b/org.hl7.fhir.validation/src/test/java/org/hl7/fhir/terminology/tests/TerminologyServiceTests.java
@@ -140,9 +140,9 @@ public class TerminologyServiceTests {
       fo.delete();
     }
     if (setup.test.has("profile")) {
-      engine.getContext().setExpansionProfile((org.hl7.fhir.r5.model.Parameters) loadResource(setup.test.asString("profile")));
+      engine.getContext().setExpansionParameters((org.hl7.fhir.r5.model.Parameters) loadResource(setup.test.asString("profile")));
     } else {
-      engine.getContext().setExpansionProfile((org.hl7.fhir.r5.model.Parameters) loadResource("parameters-default.json"));
+      engine.getContext().setExpansionParameters((org.hl7.fhir.r5.model.Parameters) loadResource("parameters-default.json"));
     }
     if (setup.test.asString("operation").equals("expand")) {
       expand(engine, req, resp, setup.test.asString("Content-Language"), fp, ext);
diff --git a/pom.xml b/pom.xml
index d1633dfd5..02d08d870 100644
--- a/pom.xml
+++ b/pom.xml
@@ -20,7 +20,7 @@
     <properties>
         <guava_version>32.0.1-jre</guava_version>
         <hapi_fhir_version>6.4.1</hapi_fhir_version>
-        <validator_test_case_version>1.4.23</validator_test_case_version>
+        <validator_test_case_version>1.4.23-SNAPSHOT</validator_test_case_version>
         <jackson_version>2.16.0</jackson_version>
         <junit_jupiter_version>5.9.2</junit_jupiter_version>
         <junit_platform_launcher_version>1.8.2</junit_platform_launcher_version>