Same problem, randomly:
2.6.24-16-generic 64bit, Feisty Dual quad-core Intel Xeon E5335 NVidia Quadro FX 3450, 256MB Restricted drivers 169.12 Two Dell 2407wfp monitors, 3840x1200 pixel total, 24 bit
Same problem, randomly:
2.6.24-16-generic 64bit, Feisty
Dual quad-core Intel Xeon E5335
NVidia Quadro FX 3450, 256MB
Restricted drivers 169.12
Two Dell 2407wfp monitors, 3840x1200 pixel total, 24 bit