Thank you very much for this question. This reminds me of a compatibility issue that we used to have between QTCAD and newer versions of PyVista, which is the module used to plot the mesh. This specific issue that I am thinking of was fixed less than a year ago.
Your problem may be due to using a later version of PyVista with an older version of QTCAD.
If this is the issue that I am thinking of, it should be possible to solve it in the following way.
Log into the client portal.
Download the latest version of QTCAD (1.2.5).
Uninstall the old version of QTCAD on your machine. The safest way to do this is to wipe out the entire qtcad conda environment to make sure that you are not stuck with old versions of dependencies.
conda env remove --name qtcad
Then change directories to the one with the new QTCAD version, and install the tool with:
conda env update -f qtcad-win.yml
conda activate qtcad
pip install .
Then, I recommend that you try again and hopefully, the problem will have disappeared.
If not, please send us the QTCAD version number you are using (
conda list can be helpful to find the version of qtcad), your OS, and a minimal set of scripts that reproduces the error.