@helverk – if custom permalinks (/%category%/%postname%/) don’t work for your WordPress without BuddyPress installed, then the problem is in your basic WordPress server setup, and not to do with BuddyPress.
You need to make sure you can run WordPress correctly with permalinks, before moving on to the BuddyPress installation. Unfortunately, the WordPress forums would be the best place to get an answer on this one.
