Also since updating to 1.0.10, I've noticed on occasion that my movement keys get stuck. For example, if I go down, my character goes down then immediately back up. Very dangerous... I have to restart the game in these cases.
No need to restart the game ; just press again the direction which is stuck. In your example, press "up" again. It happens if you're walking into a direction and something special happense : leveling up, completing a quest, cleaning a zoo...