I wish I could help more, the only thing I can think of would be on the tv, or in the settings(not much there) but if the Revue is doing it hell im as baffled as you, let us know if you solve this. When I had mine hooked up to DTV SD channels did not do this.
I think that because the recovery is ro.secure 1 that it will not allow any updates unless its been pushed via OTA, Then again its been a while since I have messed with the revue and I may be wrong. Sounds like you may be getting somewhere at least more than most people on the forums.