I fixed the tag break problem by also checking to see if there is an HTML tag starting before the post cut position. If there isn't then the post is cut right at the designated value.
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.