Thanks @nicholasj for the complete console transcript. It looks to me like you’re using the full Anaconda, and that everything is currently in order. (I no longer see the warnings which you originally reported.)
Please let me know if you spot any unexpected warnings in the future. The latest PyMC version 4.1.2 has hopefully solved all the remaining such bugs.
Also, everything should work smoothly with the lightweight Conda distributions like Miniforge and Mambaforge.