Yesterday an update to some bits of the nVidia 295 driver popped into the system. After the update the Secondlife viewer was badly screwed with a black screen, so I rebooted, thinking that the utils were clashing with the new driver. After this boot, I could log in to Mint12 with Mate or Groan3, but not with Cinnamon - it just hung with my background up, but nothing else, mouse still moving, the only way out was to CTRL-ALT-BSPC. As I could use Mate, I removed nVidia, and reinstalled nVidia 280, which is what I am running now with Cinnamon.
Did anyone else see this? Or is it my hardware?