OK all, thanks for confirming what I figured was the way ahead.

Heres what happened next.

Party Poker No-Limit Hold'em, $0.25 BB (6 handed) - Party-Poker Converter Tool from FlopTurnRiver.com

Hero (Button) ($49.58)
(SB) ($24)
Villain2 (BB) ($15.19)
UTG ($3.27)
MP ($26.04)
Villain CO ($21.43)

Preflop: Hero is Button with A, A
Villain2 calls $0.25, 1 fold, Villain calls $0.25, Hero raises $1.25, 2 folds, Villain2 calls $1, Villain calls $1

Flop: ($4.10) 3, 7, A (3 players)
Villain2 bets $1.75, Villain calls $1.75, Hero raises $8.17, 1 fold, Villain calls $6.42

Turn: ($22.19) 8 (2 players)
Villain checks, Hero ??

Turn card not nice, what do we make of villains turn check? This is an obvious check behind for hero no?

BTW Villain is CO, for some reason HH converter originally put him in SB.