With the limited info, this looks like it could be an issue with the storage of the schema version. In order to properly assist you we recommend opening a support ticket for personalized support.
If you are reverting back without using a Database backup from before the update, there will be issues. SmarterTrack 14 changed the way related items are stored in the Database, so rolling back without that backup will cause issues with your related items.
Eric McCarthy
Software Developer
SmarterTools Inc.
www.smartertools.com