Its related to OOM errors. I have had the same thing happen before. A reboot fixed it for me.
Ok it is now a regular occurance. However a reboot does clear it and it occurs much more quickly in game if the PC has been in use for some time prior to starting AH.
Obviously I could start rebooting every time I want to load AH. But IMO this is addressing symptoms rather than faults.
If it is OOM what are the possible causes. Could something (new) be inducing memory consumpton? How could I check for this?
Does memory get old? Main RAM is over 3 years old now. Graphics are about 18 months. Would upgrading to 4gig RAM help wit this problem?