Having just installed 12.10 I notice that I get fuzzy text and icons that change when I move my mouse over them. See picture below as an example. What could be wrong? I have a NVIDIA Quadro 600 graphics card.
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Try updating your drivers. If the problem persists, then you could try to test the card in another system or OS to see if it works normally. If it doesn't work in another system or under windows then it might be a hardware issue.