Thanks Ben, good idea. I just used a binary search to find the offending theme; it was "Qt" in my case. With that directory, gnome- theme-manager hung; without it, it works fine.
/usr/share/themes/Qt contains: /usr/share/themes/Qt/gtk-2.0/gtkrc style "default" { engine "qtengine" { } } class "GtkWidget" style "default" so I guess some incompatibility between gnome-theme-manager and gtk2-engines-gtk-qt or gtk2-engines-qtpixmap? -- gnome-theme-manager hangs, stops updating UI https://launchpad.net/bugs/68578 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs