This is just 1 example of what I would be using the Wblock for. I create a model drawing with xrefs for the background, and contract drawing sheets to follow their intended layout, as well as anything else I would like to have in my drawing while coordinating. I then create a wblock of just the content, in this case chilled water piping. I had never had an issue with the wblock not working until recently. When I create the wblock from this job, I can open it in AutoCAD just fine, but it will not load into Navis. If I were to select all of the content, copy it to my clipboard, then paste it into the wblock drawing it will open in Navis just fine. It is an acceptable work-around, but it is a little more time consuming because I have to have the model drawing open and the wblock drawing open, delete the content currently in the wblock drawing, then copy and paste from the model back into the wblock drawing versus simply just wblocking out of my model drawing. I hope this helps you understand what I am trying to do. Any help/guidance would be appreciated.