I can confirm the original bug description, the symptoms are 100% the same. I have experienced it by using either Opera, Varicad or Yakuake. System info: Kubuntu Dapper 6.06.1; KDE 3.5.3; 2.6.15-26-686; nvidia proprietary drivers.
-- Xorg process freezes, uses 100% of CPU. Can be killed by remote terminal. https://launchpad.net/bugs/51991 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs