I am using GTPack v1.3 on Mathematica 12.1, and obtained an error when I tried to run the CrystalFieldSplitting routine going from Oh to D3d. I get an error that D3d is not a subgroup of Oh, when in fact it truly is a subgroup (see here).

This is a very basic operation, so am I missing something here? Or is this an error in GTP?

Matthias Geilhufe Answered question 8. March 2021