Was speaking to one of the Pioneer support team a couple of weeks ago about the vageries of the EPG. It updates twice a day (mine does it at 2.30pm and 3am), If it cannot update at the selected time it will move the preset by and hour or more and try again. If yours if updating at 7.30pm leave it on for a couple of days and it should move to a sensible time.
It alledgidly takes 2 hours to update as 'it has a lot to do' He couldn't expain it further than that but when I put it to him that maybe it deleted old programs ie. since the last update, downloads the
next 24 hours along with any program
information stored about the program (Gangs of New York and The Pianist had star ratings next to them this w/end!) he said it 'sounded reasonable' although could only offer a weak signal as a reason it all took 2 hours
Also asked him what all the stats meant on the update screen and he said "they" didn't know. After I stopped laughing I asked him If he could find out as it seemed unlikely that Pioneer would put a load of potentially useful diagnostic information on the box and not know what the hell it was for. Haven't heard from him since.