Dorico 5 does not start / "Audio engine: Waiting for connection"

Hello every time i open Dorico 5 elements I see Audio engine: Waiting for connection. Any idea?
Dorico Diagnostics.zip (1.3 MB)

What if you reboot your machine, any better then?
No joke, it could be that some zombied audio engine process is around which allows Dorico not to connect to it any more. So a reboot guarantees a clean state for a new test.

regardless new start, restart, always the same

Did you see my private message to you?

The diagnostics always contain the logs of the last 10 runs of the audio engine.
Mostly those logs are empty, but there are also some runs, that did succeed to run and also shut down properly. Those were the runs 3, 7 and 9. Run 4 and 5 started properly but later on broke off. All other log files are empty.
What if you start again Dorico and have a look in the Activity Monitor then? Is there some process with VST in the list of processes?