Ok, seems all is good. I power cycled the devices and they came back up on the new firmware

Crap, I just upgraded too and see the same thing. Did you ever get it fixed? I am happy enough to live without the web part if theyt keep tranferrring data but I am afraid to power them off now in case they wont come back

I too have a similar issue and have no idea how to troubleshoot it. Is there any way to debug/tap the connection or point the devices to a syslog server or something like that?