Steps to Reproduce

1. Create a page that has more than one column.
2. Save it, then go to Add > Gliffy Diagram (or UI Mockup).
3. Create the diagram then Save and Close.

The Gliffy diagram is added above the top of the columns instead of in one. It doesn't appear possible to move the diagram, instead you need to remove and re-create it in the correct column.

I'm not sure what the correct solution would be here since it could be tricky to determine which column the Gliffy or Balsamiq item should be in...