Sometimes the "/sell" command doesn't sell all items, even though it's listed in the sell.yml file. If you drop the items, pick them up and try to use "/sell all" again it works fine.

you need to sell all. sell defaults to hand.

I know @drtshock, my players and I use "/sell all". But ever since the new 1.9 update some items haven't been possible to sell.

such as?