No, that is not what I meant.
I meant to be channel surfing within a favourites group, you need to select the group and select a channel within the group with the fav key (and arrow/ok keys to select the channel), as per PRL/Peters post above. Once you do that, then up/down surfing is in the order that you setup in your fave group, and the EPG is in that same order. Once you do that, then you don't have to keep doing it unless you want to move to a different favourites group.
I personally have not deleted the "placeholder" channels that (especially) 7 (and to some extent SBS) broadcast (e.g. 7 Digital 1, 7 Digital 2, and SBS3 SBS4 SBS5), as they may actually choose to put something on these channels apart from the same thing as their main channels. Once you have setup a fave group, you can forget about them until one day you see them advertise (or read on a forum) that something new has come up, then you don't need to rescan to get the channel that you deleted, which has nasty side effects like deleting or buggering your timers, buggering your favourites group etc.
As far as missing info goes... ok, lets try to work through this with a clean slate.
*Did you get any duplicates with the *same* channel number, e.g. two "7" LCNs? You said you got multiple Channel Sevens, but I don't know if you meant multiple "7" LCNs (logical channel number, the definitive number to access an Aussie TV broadcast), or you mean the "7 Digital 1" "7 Digital 2" channel NAMEs (these are NOT LCNs. The LCNs for those are 71 and 72 I think from memory).
If you got more than one LCN 7, then more than likely you are receiving the broadcasts from two different locations. This can confuse the Wiz, as it only loads EPG into the 1st one it finds, not all of them. For free to air EPG, there is a "quirk/bug" also with this, in that if the two broadcast locations have the same network information, and you delete all the channels except one channel from the wrong broadcaster, you won't get any EPG for the *whole* other broadcast location in some instances.
So when you bring up the list, choose "all services" and then carefully go through the list and ensure you delete ALL the services from the duplicate broadcaster with the poorer reception. That service view shows you the RF frequency & channel number, as well as the LCNs and channel names in the list, so you can determine which of the LCNs are from which frequency.
Second potential "gotya" is are you are in a regional area, and so the specific LCNs that ICE believe you have are regional? If your LCNs are different to what ICE thinks is in your area, you won't get EPG for those channels.
So as per my Sydney list: ABCHD,ABC1,ABC2,7HD,7SD,9HD,9SD,10HD,10SD,SBS1,SBS2,SBSHD
the LCNs for these MAIN SD/HD channels in Sydney are:
20,2,22,70,7,9,90,9,1,10,3,33,30 (can't remember the SBS ones exactly).
ICE may also load EPG up into LCN21 which is another "placeholder/copy" of ABC1 on LCN2.
In regional areas Seven is on the LCN6 range I think, and Nein is on the LCN8 range I think. TDT, Win etc etc are potentially on different numbers. Have you setup your ICE webpage profile to be in your correct area, and ticked all the channels you want?
Finally, is the ICEguide option enabled or disabled in the Beyonwiz? It can disable itself if it can't contact the ICE servers, and so the EPG you are looking at may not be the ICE but the local broadcast guide instead, and often that is of dubious quality & quantity in some regions.
Hope this helps, good luck!
Regards