Quote Originally Posted by 'keyclone',index.php?page=Thread&postID=45938#post 45938
do you use synergy?

could you be 'in' one screen holding down a key.. and your mouse moves to another screen... and the 'key up' never gets transmitted?
That must be it. I had the same problem and finally figured out that if I went back to the window and hit the same key for the direction I was running he would stop.