Hi, I installed wireshark, and after a few crashes, the application seems stable.
I did the recording first with media center 27.0.39, then with the latest version of media center 28.
Attached to the email, you will find the file logs.
I hope it will be useful to you.
Also, for your information, I installed media center 28 on a pc with windows 10 and it doesn't work anyway. It only works with version 27.0.40, I don't remember exactly.
I guess you can rule out my iMac and the other pc. I haven't tried with another renderer, I used to use the apple tv 4K before, but that doesn't count because I didn't watch movies with jriver media center.
Greetings,
Massimiliano Avinio