Yes, an alternate way to listen is with the following link. Download it and then play the file.
https://listen.radionomy.com/muppetcentralradio.m3u
If you're in the US, you'll need to listen with WinAmp. (Available at
winamp.com. The "lite" install is fine.) If you try to listen with another player it will be blocked and you'll hear a voice-over saying to listen on
radionomy.com.
If you're outside of the US, the above M3U link should work with nearly any media player you have installed.
The maintenance should hopefully be completed tomorrow as the techs are making major hardware upgrades on Radionomy's servers.