Maybe I'm being paranoid, but I've never seen a MacOS update cause disk and file corruption, and permission issues like 10.6.7. My MBA freezes like many others, so I just ran a disk verify and it came back with two errors. Verifying permissions resulted in a huge list of errors. So, now I'm beginning to wonder... I've been using Macs since 1985.
My 24in iMac began having what appeared to be a failing HD issue. Now that I think about it, the timing of the problems relates to updating the machine to 10.6.6. Now I'm wondering if, for some of us, did the root of this problem really begin with 10.6.6? My iMac also suffered from the same disk and file/permission corruption just like my MBA has with 10.6.7, and it still worked, although slowly.
I just replaced the HD in the iMac and it's running .7 with no apparent issues. Installed 10.6.3 and went straight to 10.6.7.
So I'm baffled yet very suspicious that the root cause extends to changes within 10.6.6. ??? Now I wonder if the old HD in the iMac is actually failing or was simply just corrupted to the nth degree.
I've been in the IT field for decades and when my gut tells me something, it's far more often correct than not.