I was 100% sure that reinstall will solve the problem. My guess was that a plugin or Windows Update messed up with some of the underlying system or shared libraries and consequently resulted in an odd behavior. That’s also the reason why “roll back” didn’t work.
Well, that’s lots easier because the Gig Performer team provided instructions 
You know that we have a Windows optimization guide that besides many optimization tips includes other useful stuff and best practices that people will find handy, i.e. backups: Create a full system backup of working configuration
More tips: FREE e-book by Deskew - Optimize your Windows PC for the stage!
NB: If you don’t want to use Microsoft tools, there are great free third-party tools, such as Macrium Reflect.