I rebooted Id MC and went back to DLNA Servers. I notice that "Format: PCM 24-bit" is grayed out. Is this a problem? If so, I can't click on it to change format.
Also, since Id MC crashed just now, is it possible that it is crashing repeatedly and that is what caused the original loss of contact between JRemote and the Id?
A crash of MC shouldn't cause it to lose settings, a crash of the Id might.
The PCM24 bit should be grayed since you are sending original format.
It does make sense to power cycle the Bel Canto, DLNA renderers can sometimes get wedged.
Are the tracks actually available? What happens if you right-click on one and do Locate?
When you can't get at the options, perhaps it's behind the main UI, try moving that.
Or try control-o
Do you know if any custom DLNA controller options were set in MC (right-click on the Bel Canto zone and look at DLNA controller options and associated DLNA server settings)