Graphic glitches, flickering and mangled text under Leopard?

New to the Mac scene, so I'm not sure how to describe this, but it seems like something happened to the desktop rendering. I've got a few apps running - Transmission, Adium, Skitch, nothing amazing - and was reading through Google Reader, when I noticed some graphical glitches, flickering, flashing... certainly not smooth and pleasant. Text would get "smudged", or scraped and mangled, as it enters the browser at the bottom when scrolling. I'd take a screenshot, but every time focus switches to a new window, the redraw fixes it. Switch back to the browser, scroll a bit, and it's still there, though.

I've killed and restarted both Firefox and Safari - in which this anomaly is happening - to no avail. It seems that the graphic engine needs to be restarted, or something's screwed it up... my question is either a nice way to do that, or if restarting the system is necessary. I'm really after an answer as to why it's happened, and the best practice in this case, but I'm at a loss as to how to form the Google query for such a thing. TIA
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Eoin OSullivanConsultantCommented:
Are you sure it is Safari/Firefox .. or perhaps the implementation of Google Reader has refresh/redraw issues in OSX?

wysardryAuthor Commented:
Actually, it was Spaces, seemingly. Turned it off, and all was better.

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