Ok, I just spoke with my JVC dealer regarding the "dark horizontal bar" problem while watching HDTV feeds on the new 48" JVC AV-48WP30.
JVC is aware of this issue. The fix is to go into the service menu and correct the set-up of the input which is being used for the HDTV feed. They are not telling me how to do this as they don't want people to know how to get into the service menu.
I haven't seen the fix done, but I assume that it does the trick.

JVC is aware of this issue. The fix is to go into the service menu and correct the set-up of the input which is being used for the HDTV feed. They are not telling me how to do this as they don't want people to know how to get into the service menu.
I haven't seen the fix done, but I assume that it does the trick.