After latest glib release 2.23.1 a xfce panel has gained a window decorations.
This is caused by some bugfix workaround in glib
And here is the quick fix http://svn.mandriva.com/cgi-bin/viewvc.cgi/packages/cooker/xfce4-panel/current/SOURCES/xfce4-panel-4.6.2-gtkwindow-type.patch
Created attachment 2758
A quick fix
Created attachment 2759
Don't use g_object_set
Could you try the patch attached?
Tried it myself, works without problems now. Will release a new version of the panel today.
*** Bug 6400 has been marked as a duplicate of this bug. ***