Hi,
I think they did somthing to the layout engine. I had e view problems, had to redo a screen layout as well. But moast of the windows are ok. And I use tabs all over the place.
As I see it the only problem I had were problems in windows I wos working on. In thoose windows I lost internal queries etc as well.
So a tip might be before you upgrade make sure no windows are open ( screen edit mode)
You might have luck doing a recompile.
regards
Allard