[mythtv-users] Really strange mythtv / direct tv problem

[ben at ultraswank.com]

So my direct tv setup has been working just fine for months now, but
suddenly my myth box is unable to change the channel to certain stations
on my direct tv.  Not all mind you, channels above 190 seem to work fine. 
The Myth box brings up the station information as if it thinks that it has
changed the channel, it just doesn't seem to be communicating correctly,
and changing the channel directly through the direct tv box works fine so
these channels aren't blocked in any way.  Like I said this was all
working just fine up until this last week, and I hadn't done anything
lately to my myth box.  Has anyone else experienced anything like this?