Couple bug fixes.

app/models/SuperModel.coffee

@@ -32,7 +32,7 @@ module.exports = class SuperModel extends Backbone.Model
     else
       @registerModel(model)
       res = @addModelResource(model, name, fetchOptions, value)
-      if not res.isLoaded then res.load()
+      if model.loaded then res.markLoaded() else res.load()
       return res
 
   loadCollection: (collection, name, fetchOptions, value=1) ->

app/views/modal/versions_modal.coffee

@@ -43,8 +43,8 @@ module.exports = class VersionsModalView extends ModalView
   onSelectionChanged: ->
     rows = @$el.find 'input.select:checked'
     deltaEl = @$el.find '.delta-view'
-    @deltaView?.destroy()
-    deltaEl.empty()
+    @removeSubView(@deltaView) if @deltaView
+    @deltaView = null
     if rows.length isnt 2 then return 
     
     laterVersion = new @model(_id:$(rows[0]).val())