Prior to this ACR release, the curve mode selected was always the last mode used. With this update, it always starts in Parametric Curve mode. Even when opening a previously edited file with changes only in the Point Curve, ACR starts in Parametric mode.
Why? This is new behavior. Having to select the point curve button every time I edit a file is a waste of time, and I believe is a bug.
ACR 15.0.0.1264