Some but not all
That maybe true with some of the VIP's but not all. I didn't have to delete the channels here that shifted to another ch. The station where I work went from 13 (virtual 9) to true 9 and CBS in our area left it's UHF slot (virtual 7) and moved to true 7. I didn't have to delete either but with a rescan they came up as correct. I think there may be more to this than just what is seen by the VIP. I think the station must have to chance something in the PSIP data stream to get the unit to lock on to the new real/virtual ch. combo.
It seems that the problem with the ViP receivers when a station changes frequencies but keeps the same virtual channel, the ViP does not drop the original RF signature but keeps it associated with the virtual channel and then adds the new frequency also associated with the same virtual channel and the receiver says WHAT!!!.
My 622 locked on to one of the old RF frequencies and would not change channels until I went in and deleted the bad data.
So you need to delete ALL your channels (especially those who change frequency) and rescan so your receiver will drop the invalid associations between RF and virtual channels.
That maybe true with some of the VIP's but not all. I didn't have to delete the channels here that shifted to another ch. The station where I work went from 13 (virtual 9) to true 9 and CBS in our area left it's UHF slot (virtual 7) and moved to true 7. I didn't have to delete either but with a rescan they came up as correct. I think there may be more to this than just what is seen by the VIP. I think the station must have to chance something in the PSIP data stream to get the unit to lock on to the new real/virtual ch. combo.