Hello there!
Did you try to Verify and fix game client files? It´s next to the Play button if you click on the arrow next to it. As a different solution I found this ->
Client Full screen 'input not supported' last post.
"go where the game is installed>Allods Online EN>Personal>open the file ,,Global,,with Notepad and change gfxRefreshRate=85 to gfxRefreshRate=60"
Hope that helped!
Greetings!