I wrote to an E* tech, and here's his response. It "sounds" promising, but my skepticism level remains high:
"The hardware is designed to produce the correct level output on SD and
the test results reflect that with careful stand alone measurements. The
chip that produces the video output though has several settings, many of
which are undocumented by the vendor, that controls numerous parameters
of the video. We have been working closely with the vendor to find the
right set of parameters that are causing this problem. Of course the
vendor thought the original settings were correct. It has taken some
time, but we believe we finally have the correct mix to produce video
that meets the specifications on SD output. We have our internally
tested changes in the current internal software. As long as the tests
continue to work out and do not cause any unwanted side affects, we will
have this new set of parameters in the release of code that will also
contain the dish home channel. It is currently called P266, but this is
subject to change if an emergency release is needed for some reason."
So, I'll wait to see what 266 does on Friday (assuming it's released on Friday) and if it doesn't fix it, then it'll be time to start getting really seriously upset with them - not that'll do me a whole lot of good. But, having been a 6-7 year (most contented) subscriber, I would hope that my complaining would have some effect.
-Joe