Hi, i know it is old, but the aplication is not working propertly (like was reported by another users)
So, i checked the source code and the problem is (on line 44):
ControlSend,%focus%,{Left %length%},ahk_id %active%
So, need add "
+" before:
ControlSend,%focus%,+{Left %length%},ahk_id %active%
That is all to fix the problem.