OS: Windows 8.1 64-bit
I had the Malwarebytes main app and the Malwarebytes Windows Firewall Control. When my 14-day premium trail was over, I decided to switch off autorun option for the Malwarebytes app. And somehow, it caused WFC to stop working ("can't connect to malwarebytes windows firewall control service"). So I uninstalled Malwarebytes app, and WFC works fine.
I suppose this does not affect premium users - only because they run Malwarebytes main app all the time.
But in my case, if it didn't start with the system, then there were problems.