I have some input issues at a game called Metin2, which has millions of active players.
Although I am able to start the game, skip the intro videos by pressing a few times "ESC" and in case I was fast enough, there is a small time frame for moving the mouse. But afterwards I was't able to use the mouse or the keyboard. Thus you can't choose a server or a channel. I have prepared a video which shows the problem: https://vid.me/7e5R. SOUND MIGHT BE LOUD
I tried it with several different settings but none of them worked.
I hope for support with getting the game started