i had 4 or 5 city sieges/defs so far and in everyone i faced the problem, that i wasn't able to leave my group (leave button doesn't even shows up when i rightclick on my group) and also joining a new group didn't word. The command /rel didn't help. I got rid of all addons im not using anymore and i still use: enemy, s.o.r., targetring, buffhead, cmap confing, range checker, swift assist, anywhere trainer, deathblow 2, rvmod-manager.
Couldn't get any advice for it in advice channel, so maybe here someone's got an idea. Appreciate help, cause particularly in Stage 3 of city it can get really annoying

Thanks and regards!
zz