Pretty odd. If it worked with the old box and dish hasn't moved. It should pick up something with Single 5150 and blind scanning at least.
Check your firmware revision. I've found this comment in the following link below -
"Hi dont know if youve fixed this yet but i think its the 17/7/11 software that wont find channels when scanned (at least thats how it is for me) so if you put an earlier or later firmware it should be ok"
maybe try firmware update or downgrade?
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