Replace data-dismiss=modal with action close. It's better to use our own ember code instead of relying on bootbox magic.

app/assets/javascripts/admin/controllers/admin_ban_user_controller.js

@@ -13,11 +13,13 @@ Discourse.AdminBanUserController = Discourse.ObjectController.extend(Discourse.M
     ban: function() {
       var duration = parseInt(this.get('duration'), 10);
       if (duration > 0) {
+        var self = this;
+        this.send('hideModal');
         this.get('model').ban(duration, this.get('reason')).then(function() {
           window.location.reload();
         }, function(e) {
           var error = I18n.t('admin.user.ban_failed', { error: "http: " + e.status + " - " + e.body });
-          bootbox.alert(error);
+          bootbox.alert(error, function() { self.send('showModal'); });
         });
       }
     }

app/assets/javascripts/admin/templates/modal/admin_ban_user.js.handlebars

@@ -10,6 +10,6 @@
   </form>
 </div>
 <div class="modal-footer">
-  <button class='btn btn-danger' {{action ban}} data-dismiss="modal"><i class='icon icon-ban-circle'></i>{{i18n admin.user.ban}}</button>
-  <a data-dismiss="modal">{{i18n cancel}}</a>
+  <button class='btn btn-danger' {{action ban}}><i class='icon icon-ban-circle'></i>{{i18n admin.user.ban}}</button>
+  <a {{action closeModal}}>{{i18n cancel}}</a>
 </div>

app/assets/javascripts/discourse/controllers/edit_topic_auto_close_controller.js

@@ -31,16 +31,18 @@ Discourse.EditTopicAutoCloseController = Discourse.ObjectController.extend(Disco
   },
 
   setAutoClose: function(days) {
-    var editTopicAutoCloseController = this;
+    var self = this;
+    this.send('hideModal');
     Discourse.ajax({
       url: '/t/' + this.get('id') + '/autoclose',
       type: 'PUT',
       dataType: 'html', // no custom errors, jquery 1.9 enforces json
       data: { auto_close_days: days > 0 ? days : null }
     }).then(function(){
-      editTopicAutoCloseController.set('details.auto_close_at', moment().add('days', days).format());
+      self.send('closeModal');
+      self.set('details.auto_close_at', moment().add('days', days).format());
     }, function (error) {
-      bootbox.alert(I18n.t('generic_error'));
+      bootbox.alert(I18n.t('generic_error'), function() { self.send('showModal'); } );
     });
   }
 

app/assets/javascripts/discourse/routes/preferences_routes.js

@@ -46,6 +46,7 @@ Discourse.PreferencesRoute = Discourse.RestrictedUserRoute.extend({
         'uploaded_avatar_template'
       ));
       user.set('avatar_template', avatarSelector.get('avatarTemplate'));
+      avatarSelector.send('closeModal');
     }
   }
 });

app/assets/javascripts/discourse/templates/modal/auto_close.js.handlebars

@@ -4,7 +4,7 @@
   </form>
 </div>
 <div class="modal-footer">
-  <button class='btn btn-primary' {{action saveAutoClose}} data-dismiss="modal">{{i18n topic.auto_close_save}}</button>
-  <a data-dismiss="modal">{{i18n cancel}}</a>
-  <button class='btn pull-right' {{action removeAutoClose}} data-dismiss="modal">{{i18n topic.auto_close_remove}}</button>
+  <button class='btn btn-primary' {{action saveAutoClose}}>{{i18n topic.auto_close_save}}</button>
+  <a {{action closeModal}}>{{i18n cancel}}</a>
+  <button class='btn pull-right' {{action removeAutoClose}}>{{i18n topic.auto_close_remove}}</button>
 </div>

app/assets/javascripts/discourse/templates/modal/avatar_selector.js.handlebars

@@ -29,6 +29,6 @@
 </div>
 
 <div class="modal-footer">
-  <button class="btn btn-primary" {{action saveAvatarSelection}} data-dismiss="modal" {{bindAttr disabled="view.saveDisabled"}}>{{i18n save}}</button>
-  <a data-dismiss="modal">{{i18n cancel}}</a>
+  <button class="btn btn-primary" {{action saveAvatarSelection}} {{bindAttr disabled="view.saveDisabled"}}>{{i18n save}}</button>
+  <a {{action closeModal}}>{{i18n cancel}}</a>
 </div>

app/assets/javascripts/discourse/templates/modal/upload_selector.js.handlebars

@@ -27,9 +27,9 @@
 </div>
 
 <div class="modal-footer">
-  <button class="btn btn-primary" data-dismiss="modal" {{action upload target="view"}}>
+  <button class="btn btn-primary" {{action upload target="view"}}>
     <span class='add-upload'><i {{bindAttr class="view.uploadIcon"}}></i><i class='icon-plus'></i></span>
     {{i18n upload}}
   </button>
-  <a data-dismiss="modal">{{i18n cancel}}</a>
+  <a {{action closeModal}}>{{i18n cancel}}</a>
 </div>

app/assets/javascripts/discourse/views/modal/upload_selector_view.js

@@ -42,12 +42,14 @@ Discourse.UploadSelectorView = Discourse.ModalBodyView.extend({
     });
   }.observes('controller.local'),
 
-  upload: function() {
-    if (this.get("controller.local")) {
-      $('#reply-control').fileupload('add', { fileInput: $('#filename-input') });
-    } else {
-      this.get('controller.composerView').addMarkdown($('#fileurl-input').val());
-      this.get('controller').send('closeModal');
+  actions: {
+    upload: function() {
+      if (this.get("controller.local")) {
+        $('#reply-control').fileupload('add', { fileInput: $('#filename-input') });
+      } else {
+        this.get('controller.composerView').addMarkdown($('#fileurl-input').val());
+        this.get('controller').send('closeModal');
+      }
     }
   }