@all
In the German version of Answer_HQ someone solved the same issue with changing the monitor to a normal one (usually he had a 4K flat TV connected). Somehow Gameface does not support every resolution. Also check if you use a special DPI in Windows, it should be 1:1 (100%) and not a scaled thing. Any special scaling in the brwoser should also be reset to 100% zoom. Then it might work - but maybe this solution does not work for everyone. But it is worth a shot.
Special thanks goes to @BozkurtKomando95 to find that out and sharing with us.
@Kelrycor:Thanks for the tip! It wouldn't work on my computer, then I saw your comment. I simply switched the resolution of my monitor from 4k to 1080p, and tried again, and it worked! My game face is ugly AF, but it worked! :P
Thank you for sharing your experience with us. Sometimes this workarounds really help, even just changing the resolution of the monitor. Good to know that 🙂
