* Windows 8 64-bit
* Regular Steam client (not beta)
* Regular game client.
* AMD HD7850 with latest drivers (according to Steam, Windows shows 9.2.0.0 but that certainly is not correct).
* Client is windowed no-border at 1920x1200 on a dual monitor set up (both monitors that resolution).

Video demonstrating the issue: http://youtu.be/3MrHEwW5t_E