Hi, all. On a few of the songs I just started working on, the little slider control in the extreme lower right hand corner of the Arrange window â€” the control that expands or contracts the instrument tracks â€” is not responding. When I slide the control up and down, there is no expansion or contraction of the music track. (I only have one track in place right now, the drum track). Anyway, the drum track then is stuck in its expanded state. Other songs have no such problem. Any ideas as to how to regain control over this expand/contract function? Thanks.