For the love of pete, I just ran into this issue and I can not believe how this works. I created a new recipe, entered all the ingredients, adjusted the mash steps, matched my hop AA% to those I have on hand, entered notes, hit Ctrl-Z... recipe closed and gone. I can not reproduce after closing and re-opening Beersmith and just adding a recipe and hitting Ctrl-Z, but I had done a lot of adding grains and changing prices of things so who knows what it actually undid.