Ahem... At the risk of sounding unsympathetic, Beta's are for testing purposes. You can expect this sort of thing to happen from time to time.
To be very honest, you should be telling Blizzard about this, not the Tom's community. Blizzard are the ones that have to fix these kind of problems.
I did, they told me to post my system specs and they'd get back to me. I posted my specs, and they never did.