During missions, an error message appears, indicating "Lock Error - Lock Returned," followed by an eight-figure number. The error causes the game to lock up instantly. The lock-up implies a frozen screen and repeating sound. I'm not familiar with the specific cause/source of the problem, but I suspect a relation to the updated graphic device drivers.
The only solution I've applied with success is to re-install my previous graphic device drivers, something which is not exactly desirable. Any assistance would be appreciated.