Odd Controls?

I'm just wondering if anyone else has had problems with the movement controls either being unresponsive or erratic.  I'll try to move around with WASD and the game will scroll either in a direction I didn't choose or it won't scroll for a second or two later.  Nothing else seems to be hiccuping in these instances - just scrolling.  Right-click scroll works well all of the time, but I prefer WASD in general.