Matter Controls crashes on launch with the following error:
at MatterControlMac.MainClass.Main (System.String args) [0x00007] in
[ERROR] FATAL UNHANDLED EXCEPTION: System.TypeInitializationException: The type initializer for 'MatterHackers.MatterControl.SlicerConfiguration.ProfileManager' threw an exception. ---> System.NullReferenceException: Object reference not set to an instance of an object
In my case I had a previous version of Matter Control 1.5 installed and I was able to fix it by removing the user data for Matter Control.
The data is in a ".local" folder in your home folder instead of the expected "Application Support" folder in my case:
In the terminal you can type to rename the old folder or just delete it:
mv ~/.local/share/MatterControl ~/.local/share/MatterControl_OLD