[spookybathtub]

Here are two more, also from yesterday, so I imagine they would be very similar to the other one I posted.
http://paste.ubuntu.com/12077450/
http://paste.ubuntu.com/12077451/

Any idea why it's not creating crash logs now?

[fritsch]

Oki, same backtrace. Nope, no idea about it.

So you have a working workaround for now (choosing another viz?) in doubt upgrade the nvidia blob and see if that makes a difference.