BM,
Is that the driver that John recommended, or is that from before you changed to the driver he recommended?
Just for a test, try turning the settings down as low as they will go, something like 800 x 600 x 16 or the equivalent for your setup and monitor and let us know what happens then.
To do that hit the spacebar while the beta is running and click on display settings. That will change the aquarium only.
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