I'm getting an odd bug with 2D graphics rendering in the 3.6.10 builds, where many parts of the interface are quite sluggish. In particular, the host's mission selection screen in multiplayer is very slow for me, running at about 7fps, which makes mouse movements hard to control and causes keystrokes to be delayed. The medals screen is also slow, although not to the same degree. I've noticed that the framerate also tanks when a 2D sprite takes up a large part of the screen, like when an explosion occurs right in front of you. This happens in at least the 10/28 and 2/22 XT builds for me.
I was going to post about this a few days ago but wanted to make sure I hadn't misconfigured something and didn't have time to mess around with it until this morning. I have an X1900XTX with the 7.11 drivers, and wasn't using any media VPs. Is this a known problem? I have not been keeping track of the builds coming out lately and may have missed something.