I've had similar a experience, except I started with Xubuntu 6.10 (although I've been using the Gnome desktop for weeks without any problems). I installed the KDE Desktop the other day, and now the Gnome Theme Manager crashes. At least, some of it does. The theme window remains usable, but only changes to the Window Border are applied.
I also had a list of "?" where the theme icons should be. ** Attachment added: "Gnome Theme Manager crash after installing KDE Desktop." http://librarian.launchpad.net/5068373/_usr_bin_gnome-theme-manager.1000.crash -- Theme-manager crashes https://launchpad.net/bugs/71345 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs