2nd window flashing

I inherited some code and am having a strange occurance. I open up my first gui. Life it good. I open up a second openGL application. (It might be a new instance of the first application, or it might be an altogether different application.) The second application flashes. Not the contense of the window, the entire window itself flashes in and out, even appearing and disappearing from the window list on the tool bar.

If you make the first application active, then the second stops flashing, but as I and my users go through this process hundreds of times a day, that gets kind of annoying.

Any ideas?

I did notice if I start an application that I wrote, first, then open one of these guis, that no subsequent applications will flash.

[This message has been edited by Naffel (edited 08-29-2003).]

I dont think it has something to do with OpenGL if the whole window flashes.