Sharing permissions BIG ISSUE

Question

I just bought a new 27" 3.4GHz i7 iMac to replace my agin iMac running Snow Leopard. Every time I turn the sharing on so that I can access the iMac and the attached hard drives from my other computer all the permissions explode to in infix able stse where I have to flatten the drive and reinstall Lion.  I've spent hours on the phone with Apple, troubleshooting, running bits of code in the terminal all with the same result which is the permission going ****** (including bad .kext files) Any ideas out there or should I just go for a replacement iMac?
Brian
<Edited by Host>

Answer 1

All of my permissions become corrupt to the point where I cannot open any program or access and drive as it will state you do not have permissions to do that.  When I run Disk Utility or Tech Tools, it runds for well over an hour finding thousanands of permission errors and while it state they have been fixed, non are actually fixed. The only way to "fix it is to do another clean install. I did all of this will second level Apple support inlcuding chaning some of the code vie the terminal. Again with Apple's instructions over the phone.  The only way I've been able to avoid the issue is to not selecet "Apply to enclosed items" this limits me from accessing the internal HD from my MBP but allows access to the external drives. It's a crappy crutch but it's stable so far.