Ubuntu
libwnck package

  1. Bug #187540
  2. Comment #8

Comment 8 for bug 187540

Revision history for this message
Carey Underwood (cwillu) wrote : Re: Gnome-panel freeze when 8 windows are open when the panel is on the right

http://bugzilla.gnome.org/show_bug.cgi?id=86382 is related as well, they have a half-working patch.