So I have been using iBrewmaster for a while now. I used it to dial in my system and when I use water volumes for mashing, sparging, and preboil everything goes very smoothly. So smoothly that I hit all of my gravity numbers on the nose. I recently purchased a new laptop and decided to buy Beersmith2. I created a new profile for my equipment and transferred all the specifics of my system over for example mashtun deadspace, kettle trub loss etc... So I have now brewed twice using Beersmith's water calculation and both times my preboil volume has been approximately 1 gallon short. Anyone have any ideas as to why this is? Nothing from my brewing process except using BeerSmith2.