it can be a timeout problem by the server. I have User which set expand all threads as default in his profile and when he enter some of my boards he runs in trouble. In this boards are threads with more then 2000 replys and this cause a timeout.
Check the userprofile and set the view to collapsed.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.