Have a small site running NW6.5 SP6 with Zen 6.5SP1 and only using it for DLUs and roaming profiles. Everything has been working fine for a few years. Right after we install QB 2008 Premier to a system the roaming profile no longer synchronizes to the server but it will still read from it just fine. If you delete the "Windows NT 5.1 Workstation Profile" directory from their home directory it will re-create it but never populates it. DLU continues to function fine. No quotas and we have ample drive space. No irfs in place and permissions seem to be adequate. All workstations are XP Pro SP2 and client versions are all 4.91 SP4 fully patched.

Any suggestions?