The save and grid gen errors can be reproduced by:
1. running "create_model.m"
2. save geometry in matlab workspace, g = fea.geom
3. from FEATool create new model and import geometry, "g", from matlab workspace.
4. try to save as a model (gets error)
5. go to grid mode and generate grid (gets grid gen error).
I must have some kind of an installation problem. After closing FEATool and MATLAB and restarting, I get a fail on saving a single block model. The that starts out the same as the one above "....python...".
I can do a grid gen though.
Please do not spend any time on this if you think that I may have an installation problem.
Let me re-download, re-install, and re-test. I may not get to this until tomorrow. But I should have an update within 24 hours.
I have pushed a new update that I think addresses both these issues. First a geometry processing bug for mesh generation. And a check for python for the FEniCS solver that I forgot is checked for at startup (so shouldn't throw error there unless one actually tries to use the solver). Thanks for testing.