I discovered another issue when attempting to update PyFerret 7.4.2 to 7.4.3 in conda - it thinks it has to downgrade the version of NumPy. (Another mystery to solve.) So if you have PyFerret 7.4.2 and want to update to 7.4.3, you need to explicitly tell it to update pyferret, which will downgrade NumPy. After that I updated everything and it appears to be working just fine (on a Linux system). So the commands I issued were (where "FERRET" is the conda environment in which PyFerret is installed):conda update -c conda-forge -n FERRET pyferretconda update --allconda update -n FERRET --all