Now that I'm looking more closely, this looks like some sort of initial aspect ratio issue, possibly related to a resize.
The game launches and the window either starts maximized or it maximizes itself. If I restore (un-maximize) and re-maximize, the aspect ratio is clearly different because the logo in the center of the screen gets slightly taller (while staying the same width).
In other words, the initial aspect ratio of the graphics seems incorrect (squished vertically slightly for me, running at 1920x1080).
Thanks for reporting! I'll try fixing this blind (no Windows machine handy) and send a new build; it'd be great if someone could confirm it.
I believe MS provides premade free virtualbox images for IE testing purposes too.
Do you have your windows taskbar in non-default position? Mine is on top of screen and some games in some display modes give offset mouse position