Position change in sequence kills polling thread, rather than new Problem creation

common/lib/xmodule/xmodule/js/src/capa/display.coffee

@@ -4,12 +4,6 @@ class @Problem
     @id = @el.data('problem-id')
     @element_id = @el.attr('id')
     @url = @el.data('url')
-
-    # Destroy any existing polling threads on Problem change
-    if window.queuePollerID
-      window.clearTimeout(window.queuePollerID)
-      delete window.queuePollerID
-
     @render()
 
   $: (selector) ->

common/lib/xmodule/xmodule/js/src/sequence/display.coffee

@@ -91,6 +91,13 @@ class @Sequence
     event.preventDefault()
     new_position = $(event.target).data('element')
     Logger.log "seq_goto", old: @position, new: new_position, id: @id
+
+    # On Sequence chage, destroy any existing polling thread 
+    #   for queued submissions, see ../capa/display.coffee
+    if window.queuePollerID
+      window.clearTimeout(window.queuePollerID)
+      delete window.queuePollerID
+
     @render new_position
 
   next: (event) =>