Game is behaving as if the up key is held down

[Entreaty]

Playing the game on Windows 7 64bit. Every time I start the game client, the camera pans all the way up as if I'm holding down the up key on my keyboard. I also get the same behavior if I open my map or UI settings, the map and whatever UI element I have selected will zoom all the way to the top. I am unable to adjust the camera with my mouse, though using the keyboard will adjust this momentarily until I release the keys and the camera pans back to the "up" position.

So far I have tried restarting my system, starting the client with the keyboard unplugged, and even completely reinstalling the game client. I am not getting this issue in any other games or programs, so I don't believe it is an actual keyboard issue.

Edit: I should also mention that I have tried switching camera back and forth between character/legacy mode as well as switching between full screen/borderless windowed with no success.