I demand that Malcolm Caldwell may or may not have written...
[snip; DXR3 with AFD patch]
As I said they worked in as much as when I watched that channel everything was Ok, but once I changed back to another channel without AFDs I would end up with eg. a 16:9 programme displayed as a 4:3 on my 4:3 display.
As there was only AFD information on the one channel I did not debug this any further.
ISTM that that AFD patch is incomplete. There is one AFD value which means "use the image aspect ratio"; the absence of AFD information should be treated as if that value was given.