Here's another one:
I'm in a main assembly and then open a subassembly. When I return, the file tab is now showing the name of the subassembly instead of the main assembly. The tab on the left should say SE-11008 Assembly, Door Bar. Here's a screen shot:
I'm running ST9 MP1
I believe this may have been fixed in MP2. Try installing that and see if the problem still exists.
PR 7792385: Tabs incorrect if Assembly, Subassembly opened and Part in edit mode