Can anyone explain what the dotted line is?
It’s a system track, activated or deactivated by typing ALT/OPT + T.
EDIT:
Whoops! Wrong line.
If you speak about this:
It’s because the Instrument Filter is active (it shows that an instrument is missing here, or several).
Click the green thing (don’t know the name in English!) to remove the filter.
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Close… @charles_piano nailed it. Somehow I should have known the answer but it never stood out so much before.
De(Activate) Instrument Filter
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Yes, I was just unable to name this object:
Google tells me it’s a funnel, I’ll try to remember that 
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