First, I know it's not Coronas fault but something inside of Max.
I recently made the mistake of updating my GTX 670 drivers for no real reason, and after that I get constant freezes with material editor. It can be anything from trying to load a bitmap for diffuse channel, or just changing standard Max material to Corona material. Sometimes the freezes are about a minute in length, oftentimes I've let is load for 10 whole minutes before forcing Max to shut down. It gets really annoying, even more so knowing it's because I upgraded the drivers.. so any suggestions regarding the best version (no lag in material editor) Geforce drivers or any other solution to this problem would be greatly appreciated!
EDIT: forgot to mention I'm using Max 2015 with the latest SP