Are you sure that AA works in the game? Like did you see any image quality difference or did you just check the results? When i force AA in the nvidia control panel it doesn't apply ingame. I got the beta drivers too.
You could aslo try the -norestrictions -nomemrestrict -novblank command line. Right click the GTA 4 icon and select properties, then insert -norestrictions -nomemrestrict -novblank in the target line. Put a space between the last character and each "-". It would be cool if you could report back after trying it out and tell us if it made a difference for you.
So you're saying it works with the mat_queue_mode 0? If so, it's because L4D has some problems on some multi core CPUs when using some drivers. I have been playing with mat_queue_mode 0 (same as disabling multicore rendering in video options) since the demo release because i was having the same problem as you.
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