The problem reported as fixed last April 29, but 6968, seems to have regressed for me after installing xfce 4.10 from the PPA on Xubuntu 12.04.1. I noticed when filling this form that version 1.0.2 of the plugin was not listed, so the problem might be that the PPA does not yet provide it!
That was bug #6968...
It was fixed in 1.0.2, so see with your packagers how to update to a newer version (and check if it happens with it too). The version numbers in bugzilla are a separate issue, i never remember to add them :) *** This bug has been marked as a duplicate of bug 6968 ***