I haven´t tried them myself yet, but there could be a possible reason. If your card only has 128MB it "normally" doesn´t do 6xAA and 16XAF combined. So even when you´ve chosen this setting it either switches back to no AF or 8xAF. It could be that 5.8 now "brute-forces" the setting and your card is not capable enough to handle it. Try if you get a "normal" framerate with 6xAA and 8XAF.
If you own a 256MB card then probably something is wrong with the driver.
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