VMPlayer cannot restore state: "Host pixel format" problem

re: VMWare Player 5.0.2

I am working with a Ubuntu image and suddenly (it was working at one point) I can ONLY restart the image by 'discarding' state and rebooting. I get an error message on startup saying:

"To revert to this snapshot, change the host pixel format to match that of the guest" , although the pixel attributes for host and guest that the err msg recounts *are* matching.

How to mitigate this issue?

Thanks,

Ben.