i really like the automation in live,
one click on the coresponding knob in the plugin, and the automation-lane is shown
in the track.
now, when in arrange view, i sometimes have a problem.
i automate a certain parameter, and without any further (known) action,
the automation-lane is all of a sudden grayed out.
when i try to select the parameter,
i see no colored dot, as usual, i see the following:

(the four "squares", not colored, that are highlighted, for the master mix parameter)
the automation is not "locked", and i don`t see any reason what happened.
does someone know what went wrong?
and what has to be done to make the automation work again?
to be clear: i still can change the automation lane, i can move the points around and everything,
but it`s not responding anymore, not working at all.
thanks for your help.