cannot be synced - access privileges ?

I have moved my wife user account from her MBP to our Mac Mini and ever sense then she has not been able to sync her iPhone.

This is the message that comes up:

"The iPhone "XXX iPhone" cannot be synced. You do not have enough access privileges for this operation."

This does not make sense to me as my wife has admin privileges on the computer.

I need some help with this one, Please.

Thanks,
West