See, that’s the thing… I can choose something for any other track, but the Routing dropdown arrow won’t open for the Chord track.
Here’s a file in case it helps.
11May2022.dorico (1.0 MB)
Works without problem here…
11May2022-added chords.dorico (1.0 MB)
(I’ve added a piano in slot6 to play the chords)
Hm, so it does. Here’s what happens for me.
I also tried adding another VST library and got the same issue. So maybe there’s something off about my installation?
I can’t think of a good explanation for this off the top of my head, but please do Help > Create Diagnostic Report and attach the resulting zip file here so I can take a look and see if inspiration strikes.
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I made an interesting discovery. The dropdown menus in Play Mode will only open on my laptop monitor (normally I work on my external monitor).
When I have Dorico on the external monitor (Benq EW2740L, in case it matters), clicking on the drop down menu just makes the window bar blink, but the menu won’t open. I wondered if it had to do with maybe the menu opening somewhere off screen, but when I un-maximized Dorico, it was the same.
Once I move Dorico back to the laptop screen, it works as it should.
Right! Well done, you’ve identified the problem. Do your two displays by any chance have different pixel densities, resolutions or display scaling values? If so, that is very likely the reason for the issue: there is an underlying bug in the Qt application framework that Dorico uses that prevents these kinds of pop-ups from appearing on the secondary display.
Good to know. At least the workaround is simple 
I don’t know anything about pixels/resolution/scaling , but the fact that they’re different sizes, made by different companies makes me think all of the above probably apply…