I doesn't seem to be "building the kernel"...
Did you get it to work with the older kernel?
No, I haven't been able to isolate the issue. I tried to downgrade to the ATI SDK 2.1, but it didn't take on my crappy W7 box.
Also, I'm way out of my league tweaking .cl files.
I'm happy with my 50Khash for now...
Not a W7 issue, using it right now (64bit) and with nvidia 8800gt (cuda) and no khash drops when in background.