Ive run RZ on 0.61, 0.9.8 and 1.0, the only issues ive ever had is the BE filters(Which are manageable) and ive turned off Horde Mode, gained aout 10 fps by doing that. The only time i managed to crash my server with RZ was when i stress tested our server with 200 AI( Zombies and DMS AI), other than that i have no issue what so ever.