Hello!
I'm under Win10 64, and using Spine 3.6.53
I have this bug I can't reproduce. It happens sometimes. Sometimes not. I don't know why, but I know how to fix it temporarily.
When I close Spine, my keyboards keys won't work anymore, and my left mouse button either.
I'm using a corsair keyboard K55, and a corsair mouse Harpoon.
I also have iCue, the Corsair software, running background.
If I unplugged the keyboard and mouse, and plug them again, nothing changes.
I just need to launch again Spine, and everything works fine. I don't really understand how all those are related though.