mine got bsod when running heaven benchmark on 12.11
after revert to 12.10 then ok..dunno wat happen...

May I know if you install the new 12.11beta4 after uninstalling previous driver or you just install it on top of your old driver? PC system is weird..even when using similar hardware, similar OS, similar driver etc..one got no issue while another got issues with their system...registry counts every single thing i guess or maybe even more complicated things are counted 

I never uninstall old driver before installing the new one so far no problem occurred that's why I dont have any complaints on AMD Radeon's hardware, instead I love their products and software and yes I'm talking about single card here .

I hate to admit that Catalyst driver or CCC is still buggy.
It is recommended that to upgrade driver is to uninstall the old one first using Atiman Uninstaller 7.0.2(to thoroughly clean out drivers)
It will automatically reboot upon finished installation.
Then proceed for 2nd cleaning by using Driver Clean Pro 1.5
Go to Device Manager > Display adapter to remove the driver. Check the "remove driver software...."
Reboot then install new driver.
MS Visual C++ is another problem maker. Uninstall it prior to new installation might solve your instability issues.
Sometimes a failed OCing will make the whole system hung when CCC is launching. In this case you would have to repair the CCC or more worse the whole driver, profile, CCC and MSI Afterburner

yes, I heard some ppl having issues with .Net as well. Repairing it will do.

Try catalyst 13.2 beta 7 and see, to me its the best driver so far. Yeah it's best and recommended to regularly update the driver, however if you dont have any issue with any games better stick with the old one. Just my 2 cents