/dev/nvidia0 or /dev/nvidiactl are not accessable. Picasa will crash
if these files are not accessable. To fix this, as root, please run:
chmod 666 /dev/nvidia0 /dev/nvidiactl
So I open a terminal, do a sudo chmod as requested, restart Picasa, and get no message and it runs just fine.
How can I get out of going through this chmod dance *every* time I start Picasa?
(Actually now that I think about it, it might just be once per-login session. But it's frequent and annoying.)