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As the title says, I'm seeing a weird font smoothing issue. It appears to happen randomically, mostly in Safari. I don't know exactly how to explain it, so here are a couple of screenshots from Safari:

Normal screen:

image 1

After the problem:

image 2

As the images show, it appears that font smoothing is simply disabling itself at random. It happens out of nowhere (the part of the screen where the text is quickly blinks and goes to image 2). Usually if I just reload the page (in this case) it goes back to normal.

I started noticing this a couple days ago. I'm using Snow Leopard 10.6.7.

Any suggestions on what could be causing this?

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Well, to answer my own question: the problem was that my GPU was overheating.

I forgot to mention that this specific machine is a hackintosh. I don't know if such thing can happen to a real Mac, but anyway: here where I live it's pretty hot and dry, so there's a lot of dust accumulation inside and around my computer. The GPU cooler stopped because of this (last time I cleaned it was back in March), so I just opened up the computer case, cleaned it and now everything seems to be back to normal.

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