Firefox freezing(and gimp too)

Hi all

Well, when i’m using firefox tu upload things (like in attachment on gmail or uping on rapidshare) firefox are freezing in that open dialog window. Gimp is freezing the same way on opening file. Both use the same ‘open file’ window, and both use gnome libraries (but i use kde as window manager). So i think there’s some problem with gnome libraries, but i really don’t know what are these libraries and what workarounds i can use (well, i know just the obvious uninstalling and reinstalling)

Any advices?