This may have been brought up in other issues, but I wanted to add my own symptoms.
Frequently, when I return to Sublime after using some other app, the client window (i.e, not the menu bar or title bar) fails to redraw. The only way to rectify this is to close the app and relaunch.
* happens on XP SP2 and 7
* menus still drop down (although I don't know if they do anything)
* Sublime still prompts you to save docs on exit
* I always run Sublime maximized
* un-maximising (restoring) the window doesn't help