I just updated to the 310.70 version of the nVidia driver yesterday, which is the same date as the latest patch (12-21). Since then I've had a lot of problems with graphics: characters and NPCs will flash, flicker, change color, or disappear.
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I also got the driver update but I was able to play for hours without any problems. What I do is uninstall all software and the old driver before installing the new one. In the past I have had problems just updating everything. One example is my games crashing or I go into the nVidia control panel, click Help at the top an Check for Updates and it can't connect to the update server. Since then I've had better luck just uninstalling everything before updating to the new driver.
*Disclaimer: Your experience may differ. This works for me and may not work for everybody.