Because the new updated (1.0.16) EPG Updater populates in the build in Stalker Client (referred to on IPTVtalk as "PVR.Stalker") Serial#, ID, ID2, and Sig, I had to do a reset because my original PVR.Stalker MAC was associated with those digits that I had arbitrarily made up a long time ago.
It took me some time to process what was going on but it started to make sense that I needed to do a Mac reset (see my signature for links) for me to get the device ID mismatch error to go away. Once papaio came live I was in business.