Desktop icons duplicated on dual-screen...?!

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http://forums.fedoraforum.org – hi, on my Fedora 16 LXDE dual-screen setup, desktop icons appear as duplicates on both screens ...?! huh? it's set up as one big desktop spanning over both screens, and works fine, and always has. icons on the left screen are where they are supposed to be (individual placement). since yesterday all icons from left screen have a "doppelganger" on right screen. I think the only thing I did was upgrading some packages via yum. I don't want duplicate icons on the right screen! :C can you help? thanks, ro (HowTos)