thats a mouth full,
seems to me that you might want to look at the Active Directory Server, and the service settings, for the opportunities, and solutions to correct,
I am afraid I am ALL Apple, but am very interested in what you find out, please post your results, "when" you get them.
I also have this problem, though it with local admin accounts on several differnt computers. All running osx 10.6.6 or later. All are bound to AD 2008 server, for printing and file sharing. Accounts that are having the problems are local accounts.
If I turn off the parental control, it stays off, untill that user logs out, when it gets turned back on...