Version:            (using KDE 4.3.1)
Installed from:    Fedora RPMs

Under some (very rare!) circumstances libtaskmanager seem to produce bogus entries. These entries are doubles of other real entries but are on all desktops and stay even if the corresponding task is closed. First I thought this is a bug of my taskbar applet (Smooth Tasks[1]) but upon closer look I discovered that the bogus entries are in fact in the root group of the group manager, which is managed by libtaskmanager.

Michal Odstrčil[2] has the theory that it has something to do with the "only group when taskbar is full" feature. He thinks it only happens when you change the full limit by big steps (e.g. about the size of a step from 20 to 100). But the bug is very unpredictable. In fact I haven't experienced it a while now (ever since I added some debug output to debug this issue). However, Michal did manage to reproduce it more often (and sent me the debug output).

[1] http://www.kde-look.org/content/show.php/Smooth+Tasks?content=101586
[2] http://bitbucket.org/michalodstrcil/smooth-tasks/overview/