I have seen similar behavior. What I'm about to suggest may not fix your problem, but it is worth a try. In my case it was related to one of the modifier keys: alt, ctl. Sometimes, Windows will think you have alt or ctl pressed after exiting or using a keyboard device. To fix this, press and release the alt or ctl key on the keyboard. You may have to press and release each alt or ctl key. In most cases it was the alt key that was causing my problems.