Unfortunately the latest Squeezebox Radio firmware (7.7.3) comes with a bug which prevents it from connecting to Logitech Media Server 8+. But there's a patch available, which you can install:
On the Radio go to Settings/Advanced/Applet Installer, install the Patch Installer. The Radio will re-boot.
Once it's back, go to Settings/Advanced/Patch Installer and install the "Version Comparison Fix".
What you're seeing is the result of a bug that was fixed about 7-8 years ago, but never released for the SB Radio...
On the Radio go to Settings/Advanced/Applet Installer, install the Patch Installer. The Radio will re-boot.
Once it's back, go to Settings/Advanced/Patch Installer and install the "Version Comparison Fix".
What you're seeing is the result of a bug that was fixed about 7-8 years ago, but never released for the SB Radio...