I know there's going to be no quick fix but I'm going to throw this out. InDesign CS5.5 / 7.5.2 running on WindowsXP SP3 seems to hang when the program looses focus when a file is opened. The program will ocassionally lose focus if you click on the "update" button or if you select another application/window. The result is that the file will open but InDesign does not allow any actions. Just a "ding" when you click anywhere.
Besides the obvious "don't touch your computer", any fixes/ideas? Hang on update is really annoying, especially if you don't touch anything except the update button.