Ring of Slaughter Crashes and often Freezes on PC

Hi,

every time i play Ring of Slaughter via the quickfinder in the startmenu my game freezes or crashes to desktop. If I play with my friends from friendslist instead, everything is fine. So i checked the networks settings on my router but corresponding udp ports are released.

Does anybodyelse have these issues and problems with the game on pc?

Sorry for my bad english.

Regards