DirectX function "m_swap Chain->Present(syncinterval, XpresentFlags)

I'm also frustrated by this issue. I suspect it's an IME-related problem. I suppose that the top left corner of your keyboard is "~", and I have it disabled this key in-game config so console is not shown. However, on Windows, it's changing input method. goes into Japanese input mode, which tries to convert words when I try to jump over something (yeah, pushing space key is converting another words - at least on Japanese Windows version of the OS-. Google JP IME uses DirectX?!?!?! )
I think this issue has been around for a long time, but I guess the developers just don't understand what an IME is.