https://bugzilla.redhat.com/show_bug.cgi?id=525371
--- Comment #33 from Wolfgang Ulbrich chat-to-me@raveit.de --- (In reply to Jens Petersen from comment #32)
I think also applies for MATE panel.
You're only thinking that this issue ocours with mate-panel, or are you shure? And if you're shure please add a screenshot from the issue with current Mate release (f18/f19).
Thank you