I'll do a manual gfx driver reinstall later today, with manual deinstallation instead of just doing the nVidia routine. Maybe something is screwed there. I tried newer versions over the past weeks, but found them all to be instabile, going back to 275.xx, which is the last version stabile not causing black screens every couple of minutes. nVidia drivers since 275 pretty much have been a piece of garbage. They really need to get their homework done again.
