I made a change to a potentiometer in a local schematic symbol library which then prevented me from opening the schematic and symbol library. It appears to be because I put into the description “3/8” and I think the “/” broke KiCad parsing.
I fixed it editing the text files for the symbols and the schematic. Details are at the project on Github.
I documented it at: https://github.com/PubInv/general-alarm-device/issues/34
If I can find the energy I will try to submit a bug report at: Issues · KiCad / KiCad Source Code / kicad · GitLab