It sounds like a user error. 
Sticky keys, and to a lesser extent, depressed keys at problematic points in loading, can lead to false positives, giving you secondary functions with your primary actions. It's common when running in window mode especially, you click off screen in a way that gets you locked into a secondary function on your return. I do the view rotation on mouse movement one all the time, having to actually try to rotate with the mouse in order to remove the function.
