Button to change state on multi-state box stopped working

Some questions:

  1. You changed something on your page?
    a) you cahnged some codelines in your code?
    b) you changed something inside your multistate-box?
    c) you changed the ID of your MSB ?
    d) you changed the ID of your button?
    e) you changed the IDs of your STATES of the MSB ?
    f) you don’t get any errors inside the CONSOLE ? If you get errors, which ones?
    g) if you didn’t change anything and your code do not work anymore, maybe it is an error on wix-side?