panel settings

I have a computer where we have installed Mageia 3 in place of Debian Mint.
I am using Gnome3 in Classic mode.
All is fine except that all the panel icons and the panels themselves are being DUPLICATED every time we boot. Of course we can remove the duplicated icons, but what should we do to stop the problem?
I am using Gnome3 in Classic mode.
All is fine except that all the panel icons and the panels themselves are being DUPLICATED every time we boot. Of course we can remove the duplicated icons, but what should we do to stop the problem?