OS X Lion: Where did my windows go?
If you use OS X Lion, you might run into a problem where upon switching applications, entering Mission Control, or using other features of the OS that manage application windows, the collection of currently open windows for a program may disappear. If this happens, switching to the application or hiding and unhiding it does not reveal any windows, but if you check the Window menu in the application you will see that the windows are definitely active and recognized by the system as being available.
This bug may be with one of Lion's new window management features, such as … Read more