Possible htaccess bug with groups

Sorry, don´t know the english title, in german it´s "Interessensgemeinschaften" ;-)

hiphop.at Forum - Österreichs größte Hiphop Community - Interessengemeinschaften

if you click on the number for the members:

http://www.hiphop.at/forum/groups/%2....-members.html

there´s a page not found.
I upgraded to RC5, but still no luck...

Thanks for help,
k

Please try the following : RC4 Pictures are gone

EDIT: Sorry, made a similar change in the groups-sction and now it works!