Strange grey bar in gnome shell - maybe messaging panel?

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http://forums.fedoraforum.org – Hello everyone. I am new to Fedora and have little experience with linux overall, having tried Mint, Ubuntu, openSUSE and a few others. I personally like the gnome-shell and have had no problems so far in other distros. However in Fedora, there's this annoying grey bar at the bottom which has a hotspot corner at the bottom right and whenever I open the Desktop overview (activities), it comes up - tried changing themes, but it remains the same. This never happened previously in other distros running the same version of Gnome shell. I am running Fedora 17 with all patches - Gnome 3. (HowTos)