We would love to look into what might be the problem. If you are willing, you can zip the following files and send them to me @matterhackers.com (NOTE: you will need to go to your actual username):
C:\Users\ Your Windows User Name \AppData\Local\MatterControl\MatterControl.db
C:\Users\ Your Windows User Name \AppData\Local\MatterControl\data\default.mcp
C:\Users\ Your Windows User Name \AppData\Local\MatterControl\Profiles\ Your MC User Name \opentabs.json
If you just want to try to get things working your can reset your app data.
Hope that helps.