Perhaps you were running ps in windowed mode, then switched to another application and then back to ps, that seems to cause this.
A workaround, i think pressing any of the directional buttons (for instance, if you\'re advancing, click the back arrow key) should stop the movement. If not i\'ve read that also clicking stop attack icon can stop the movement (that icon currently has no graphic, but you can see that on the stances icon bar, the left has a blank with no icon, there\'s where the stop attack graphic icon should be, try clicking there)