[GrunchCan]

Why did you check the turn? I think the answer to your dilema lies there. If you checked in order to induce action from your opponent, you must call. If you checked becasue you were afraid of the flush, you must fold.

Personally, I somehow doubt one-pair is going to take this pot down. But I probably (mistakenly) call anyway, becasue I'm suspicious of that bet. That's a weak spot in my game.