That's unfortunate. It sounds like you ran into this bug, which has no solution at the moment: https://github.com/flareteam/flare-game/issues/816
I've been recently working with someone making a Flare mod that uses Windows, and I have been providing them with development builds of the engine. If you're willing to, you can try copying the flare.exe from this to your install directory: https://drive.google.com/file/d/1DRLlo7nWfnIHNs7JBqKWrfwNPmDgMKYb/view?usp=shari...
Either way, could you provide a bit more information for me? It would be helpful to know:
- Your Windows version (e.g. Windows 10 64-bit)
- Your CPU & GPU
- If you use an alternative input method for another language