Audacity 2.3.0 won't launch

I’m running Mojave 10.14.2 and have been using Audacity for several months and in the last day whenever I try to launch it, I get a message saying that Audacity is already running and running multiple instances can cause data loss, etc. I’ve gone through Activity Monitor and the force quit menu and it’s not running. Gone through a hard reboot and even uninstalled and reinstalled the app. Same result. Any suggestions on what to do would be much appreciated.

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