When you refer to the AV setup, are you referring to the slingbox or the catcher setup? The catcher has these settings:
video:480i (standard TV)
Antenna input: HDTV antenna
The catcher is connected to a wireless bridge and is on the same subnet as the slingbox.
What I did notice is that when I was powered on the catcher, if it is a digital channel it is playing, there is no channel displayed on the opt bar on the TV screen when I change channels. The channel number only comes on when I changed to an analog (NTSC) channel and then this channel is the channel that will remain on the opt bar. I can change to other digital or analog channels, the channel number will not change.
The following link will provide you with some information and steps to follow.
Make sure to press and hold down the reset button on the SlingCatcher in order to run the System Recovery. Then, run the setup process on your SlingCatcher and let us know how it works for you.