I've recently been seeing a problem with fuse and tabbed chats. When I have tabbed chats on, and move the conversation window, there will have a window remaining showing an image of the inactive chats. It's bit hard to describe so I'll attach some images.
2 chats, tabbed.
If I drag the window up and to the left, the 2nd chat is visible underneath. However, it can't be clicked, the clicks will go through as if it weren't there.