I had the same issue when I accidentally neglected to "deactivate" the "Unlimited Resources" option in the editor before exiting the Gray Market. Unfortunately, I discovered that there is no work around. The only method is to start over (at least in my case as I was playing an Iron Man game). It was a little frustrating as I was fairly deep in the game, but it was my fault for failing to remember to follow the instructions.
Is the problem reproducible with Norton completely disabled (you may have to use Clean Boot or temporarily uninstall to verify this)?