I'm running Chromium with no issues, and have for quite a long time now.
Do you have the Nvidia drivers installed on your system? Since they aren't needed, I'd suggest using Synaptic to remove the video drivers you don't need. I tend to do this as a matter of course, and since the message you are getting references Nvidia then it would seem to be a reasonable thing to do.
Also, have you turned off hardware acceleration in Flash? If not, I'd recommend doing that, too.