Empty Dialogbox when starting VGExtreme on my second PC : VGExtreme General Discussion

Hi there,

when i start VGextreme on my second PC a empty Dialogbox appears (the one after the splashscreen, where i have to log in normally) - it's pure white.
i don't use VGextreme on my maincomp at the same time (cause i play on my own on this) and the firewalls on router and PC are deactivated but i can't log in.

what problem it could be?

regards
Me