Also I was rubber-banding all over the place, which hasn't really been an issue for me up until now. Is that a problem with the new exp. build, or maybe just the server that I was playing on?
Experimental has got alot of rubberbanding because the server framerate has become so low due to having to keep track of so much (animals, zombies, players, loot, physics) that when a player runs around corners at speed the server cannot keep up with your quick changes of direction as you go around the corner and so it just 'sees' you running in the wall instead of going around it. Then you just carry on thinking your in one place while the server still 'sees' you running into that wall. Then when you get far enough away you and the server communicate to check where you are and thats when server puts you back to where it 'sees' you, eg 'rubberbands' you.
You can prevent it happening if you walk slowly around geometry and take big arcs around corners. When they optimize the server more it will go away.
About the new driver, does anyone know if it has a sli profile configured or if we have to configure one manually like before?