That I agree with. However, it's difficult to get everything tested, in every mode. Especially for such as significant code change. But you can use 5.11 for now. Or you can force single CPU (not a good idea, imo) mode :-)
Yes, we usually are around 3 releases or so. About 6~8 weeks for a specific bug fix to show up. I believe 6.2 will have this fix. We'll see if we can do a hotfix earlier.
As for lucky to not use an ATI for home/game, I think that's backwards. No other company is as consistent in updating drivers and fixing things; I believe we give the best game experience out there, both for the newest and for older HW. Certainly give the best visual experience.
Just a note for ATI users: we have found the driver issue and have corrected it internally and are currently running it through QA. It will not make it into the Cat 6.1 release but we are looking into the best way to get it out to users.
Our Devrel and driver people should be in touch with the developers already, or shortly.
Thanks for reporting the bug and sorry for the inconveniences. For further problems, you can file a ticket under the www.ati.com website in the "my support" section of the drivers.