HDHR Viewer - This channel is not responding

Hello,

Decided to try the HDHR viewer Channel. It has worked in the past, but sporadically. Tried today but received 'This Channel is not Responding' message. On the Android app I'm receiving "This directory appears to be Empty" message.
Not sure where to look to troubleshoot. Running Plex Media Server 1.3.3.3148 on a Windows 10 Machine. All other Channels that i'm using work fine.

Any Ideas ?

Thanks !