I have experienced the same, it is probably a bug in the qt-gtk integration in Ubuntu Dapper, and I have been told that there is a fix for this in Mandriva.
** Attachment added: "picture showing the problem" http://librarian.launchpad.net/3042791/rullefelt.png -- firefox scrollbar under kubuntu is broken https://launchpad.net/bugs/47760 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
