I've noticed this problem since we got the HR34 and MRV , when the other 1/2 is in the bedroom she will hit record, but since it isn't red/highlighted on the guide she will hit it again choosing a different DVR and we end up with double series recordings and there is no way to remotely cancel recordings.
Thanks for reminding me, I should go and clean up the daughter's DVR schedule again and remove all the duplicates,but that involves running back & forth between our family room and hers comparing the 2 lists.