I installed an Nvidia 6600GT in my new computer, and thought everything was working fine. Then I noticed while playing World of Warcraft that a few textures were missing - namely feathers on things like harpies and windserpents. The areas appear now just black with a rough outline of what I used to see there. Is this a problem with the graphics card, or is it the program messing up? I just installed WoW and downloaded the most recent patch like two weeks ago. Thanks in advance for any advice.