Hitting the "Close all" or vice version "Open all" and then clicking on the - or + in a row does nothing at the first click, it needs a 2nd click to reattune itself.
2nd:
when you use the buttons Close all/Open all the "-" and "+" buttons are used wrongly, meaning "-" is suddenly used for closed and "+" for opened, where it is the other way round if you just click on a button in a row.