MCC hangs on Linux (dwegscheid)

I have a project in MPLABX 5.30 / MCC 3.95, setup for a pic16lf18326. Running on Ubuntu 18.04 64 bit. It's been set up for EUSART, TMR2, and MSSP1 for a long time. I need to add another timer. I can start MCC on the project, but whenever I try to add *any..