Ooops - I didn’t catch that this is the Nuendo section. Came here via a Google-search for something like “Cubase 10 missing solo and mute buttons”, so I did not check. As I said above, I’m in Cubase Artist 10.0.20 at the moment. Maybe the problem could be a faulty installation. I’ll check a little…
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A while later:
Now I have re-installed Cubase Artist. The problem still remains the same. But I will swap to a Cubase-group, to discuss the situation further. 