Snap: segfault in Linux Mint 19.3 due to load of incompatible Qt libraries

Hi. I have never had any problems with this program. Then today it didn't automatically load in the system tray. I rebooted, but it still didn't load. When I try to run it from the menu icon nothing happens. When I try running it from the command line (after force quitting and removing the PID file) I get:

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Fontconfig warning: "/etc/fonts/conf.avail/53-monospace-lcd-filter.conf", line 10: Having multiple values in isn't supported and may not work as expected qt5ct: using qt5ct plugin Qt: Session management error: None of the authentication protocols specified are supported Cannot mix incompatible Qt library (version 0x50905) with this library (version 0x50c08) Aborted (core dumped)

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I am running Linux Mint 19.3 Cinnamon, Cinnamon Version 4.4.8, with Linux Kernel 5.4.0-66-generic. Thanks in advance for any help you can give.