In v4.4 (ubuntu 11.10 64bit w/ KDE) when I delete a cluster from the cluster manager, I get the "are you sure" dialog box and hit "yes" and subsequently it looks as if the cluster has been removed. However, when I type into one of the former cluster's sessions, it is broadcast to all the members of the former cluster. Ok, so this seems odd, and so then I go back to the cluster manager, lo' and behold! the cluster is back! This is repeatable and while not the worst thing in the world, it is a bit of a hassle as I rely heavily on the clustering functions of PAC. Oh, and I gotta say, some nice improvements in that dept lately too! I had a friend try doing the same on their computer (his is ubuntu 11.2 64bit w/ Gnome) and he had the same issue.