Solved! Go to Solution.
The error has gone away as misteriously as it came.
I will close this as I have now different issues that also need resolution!
Read this article - "Error: pfcExceptions::XToolkitGeneralError received while trying to start or connect to a Creo Parametric session through VB API application": https://www.ptc.com/en/support/article/CS46034
Thank you for pointing it out, but the resolution indicated on this article I had already implemented without success (see above).
The error has gone away as misteriously as it came.
I will close this as I have now different issues that also need resolution!