You probably use an unstable version of glib right? Well they've created a
regression which breaks the panel. I've released xfce4-panel 4.6.3 to fix this
(to fix it quicker then glib, still their fault).
Will need to have this change synced from debian for Xubuntu Lucid
Comments from Xfce bugzilla:
Nick Schermer 2010-01-06 09:31:50 UTC
You probably use an unstable version of glib right? Well they've created a
regression which breaks the panel. I've released xfce4-panel 4.6.3 to fix this
(to fix it quicker then glib, still their fault).
Will need to have this change synced from debian for Xubuntu Lucid