Hi!
Yes, you have the problem description exactly correct.
I happen to have 4 DVR boxes, 2 LCD's, 2 Denon DVD's all
hooked to two MRF-350's (previously 300's). The 350's
are daisy chainied on the IR out.

The IR commands are always received and sent. But the
IR routing table information is lost.

So what I see on the other end is ALL devices that are
like components responding to the command even though
in my MX-3000 programming I have setup the RF Hub to route
the IR commands per device (hub two line 1 for DVD1, hub
two line 2 for DVD2, etc..).

It became apparent how global this problem was when I
hooked up DVR device number 4 to my "second RF hub" and
was getting IR flash out on that line...the only problem
was, I had assigned ALL of my DVR devices to Lines 1 through
4 on the primary hub in the MX editor. Being that it was
on a completely different station ID I had eliminated
the MRFs from the problem source. As soon as I move the
RFX to within 20 feet or so, everything starts working
flawlessly.

If you happen to have two DVR's or cable boxes to do the
test that would be fantastic. I know that these devices
are a bit hyper sensitive to IR flash and it would be
great to join the Favorites Macro test with the IR routing
test (:

Thanks in advance, we really appreciate your efforst on
improving this project. I am sure Eric Johnson at URC
will be implementing these changes and improvements.