MatterControl 1.7.5 just went away on its own
I have printed a couple of items fine. Started a 5 hour print and went away for a while. Came back and the print was about 1/2 complete and MatterControl wasn't running anymore. I restarted it and it was like it was just installed - asking me to set up the online file sharing and then installing the printer. What the heck happened? All of my settings for Quality and Materials are gone. Windows 10.
Sounds like the application data may have been corrupted somehow. If you were logged into your cloud account before then all your settings are saved online and will be restored when you log in again.