They are the same thing. TR-40 was the original name for it when they were showing it at the trade shows are the beginning of the year. Whne they actually started shipping they changed the name to DTVPal.
It's the same one in the DVR as in the Plus. The DTVPal Plus uses a Silicon tuner from Microtune instead of the old Thompson "can" tuner.
FYI, it's the same tuner as in the Sansonic and Lasonic CECBs that got top ratings for picture quality.
Is this on a new receiver that you just hooked up? When DirecTV sent me my first HR20, they forgot to include the B-Band Converters, which are needed to get the new HD channels. Once I got those and hooked them up, everything worked fine.