You are running version 7.6.2, released in September 18th, 2018; this version is far past being able to provide support for, you have a whole plethora of bug patches and feature additions since your build (UBB.threads v7.7.5, our latest Long Term Release, was released on October 25th, 2020), there isn't much we can do to support such an old build.
You can find a listing of versions and their change logs
here.
