FMLE Live Streaming to Mobile Devices Suddenly Not Working

We've been using Flash Media Live Encoder to stream to our Flash Media Server to deliver live video to desktops and mobile devices for several years with good success. 

Suddenly yesterday, the live videos are no longer able to be viewed on a mobile device.   We see a play button and no error message on the device, but it's not clickable, no live video is viewable.

Has anyone else experienced this issue?  Any indication as to where the problem might lie?  As far as I know, nothing has changed in our FMLE or Flash Media Server settings.

Thanks,

Mike