My Cubasis is now v3.7 on iOS 17.6.1. I’m using a Steinberg UR22C interface.
This has now stopped sending midi clock (yes, I’ve turned it on); it sends [START] and [CONTINUE] and [Note On], [Note Off] to the midi ports, but no midi clock. Thus, it is impossible to sync the system.
Exactly the same setup of options and tracks (at least as close as possible) works absolutely fine in Cubasis 2.8.6, and used to work in Cubasis 3.x (though with some high midi latency issues). I say this as I have 30 y experience connecting midi and audio gear so please assume I know something. By all means give me a checklist of what should be on or off, but, the fact that it works well with Cubasis 2 says there’s no issue with the actual connections.