Can't login to Mac Pro after every restart

Hi all,
For 5 days I've not been able to log into my computer at work after its been restarted/gone to sleep. The IT guys have had to do all kinds of stuff to get it working again. And every time we think it's fixed, I've come in the next morning and have the same problem, can't login.
I've eliminated that its my login details as I was able to login on another machine just fine. And others can't login to my computer, so it's obviously an issue with my machine/OS.
Does anyone have any ideas of why this would keep happening? It's as if something keeps resetting after each restart that then won't allow anyone else to login. This is all I can think of, but honestly have no idea. Any suggestions or help would be greatly appreciated as its really frustrating and putting me very behind on my work. Thank you!
Btw, it's a Mac Pro duel quad core, 16GB ram, OS 10.6.7 I believe.
Also, the admin and root can login, just not any other accounts. So the computer can be accessed, but not thru my or any other accounts on the network.

Hey there.
Well, I figured out what is causing my problem. It's Mobile accounts. I started fresh with a new install and a standard Active Directory account (not Mobile). I authenticated 20+ times. Rebooted at least 10 times. Everything worked great. Then I decided to create the Mobile account. That's when everything broke again. My Active Directory account was getting locked after one accurate attempt to authenticate. When IT unlocked it I could go one step further but then would lock me out the next time I tried to authenticate. I've replicated this twice.
So for me, it's clearly a Mobile account problem. Which is bad because half of the Macs under my care are notebooks.
Please let me know what you find out on your end.
Thanks,
Adam

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