I've no real issue about 50/50 calls, the offside, etc. These things happen every game and if we're winning comfortably then nothing is said.
I don't mind them changing their minds at scrums, the play has stopped and everyone is set, but that decision to wave the tackle count clean, allow play for 5/10 seconds and then change his mind was utterly bizarre. He directly affected the way we continued the play as Dawson looked to be shaping to kick the ball until he saw Thaler waving the count clean. We'd have been defending 10-20 yards further up the pitch. It'll be interesting to see if it's covered in the Ask The Ref twitter questions, or if he'll duck out like others have done in the past.