I don't do this much but I just tested it.
I thank you for your help bob.
More I know about my issue more I am surprised!
After your post, I remembered I have a old phone HTC Desire running Android 2.3.5. So I installed Gizmo on it and I tried streaming my web radios and it worked!
I will resume what I am experiencing with web radio streaming on my devices.
Of course the mc linux server and url's are the same for all my tests.
JRemote => iPhone 5c (iOS 9.3.5) = failed! (see attached file)
JRemote => Nexus HD 2013 (Android 6.0.1) = streaming OK
Gizmo => Nexus HD 2013 (same device as above) = failed! (see attached file)
Gizmo => HTC Desire HD (Android 2.3.5) = streaming OK
You will notice that behavior between Gizmo and JRemote are slightly differents. Gizmo won't play anything and jump to next url while JRemote will play few seconds before jumping to next url.
Videos are short so it's is more obvious to note the issue with gizmo than JRemote.
I confirm it is different when streaming from Windows, all these devices and url's work well.
I am complaining it is not working on Gizmo but finally I don't use it much. I listen music mainly from my iphone and if there's a fix for Gizmo I wish it could solve the issue with JRemote too.
Well finally I am confused about the way to solve this. Hard to find a logical...