Occasional Display Corruption With Fedora 17

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http://forums.fedoraforum.org – Running Gnome3 under F17 on an AMD Athlon 64 processor, using the nouveau driver, the display occasionally changes so as to be unusable. It is always when I have multiple workspaces, and usually have multiple terminals open. When it occurs, blank portions of the desktop suddenly contain garbage - sometimes merely stripes but often looking like a portion of a different workspace. Inactive terminals look unchanged, but when I click on one of them to activate it, I can't see the typing. Apparently the terminal is now set to show white letters on a white background. I can execute commands in t (HowTos)