[ubuntu] remote desktop viewer won't update screen

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http://ubuntuforums.org – Hello-- Have Ubuntu Hardy--- when using remote desktop viewer I log in to remote machine ok, but the screen stays at the first view and won't update. I can move the cursor on the remote machine, get into apps or folders but the remote screen won't update. The remote machine is Ubuntu Lucid. When I use the Lucid machine to log into the Hardy machine, all is well. Any help is appreciated, thanks Dan (HowTos)