OK, here's what's changed...
What was happening in the past was that if the brewer lost some volume between the boil kettle and the FV then the OG, SRM and IBU were reduced by an proportionate amount. Obviously this is wrong as losing a few pints on transfer doesn't in itself change the gravity (don't ask why I did this...I don't know either). If you had the post boil and transferred volumes set to the same amount then you will see no change in the calcs for this new release.
Now, efficiencies...I have not changed how these are calculated in this release. What may have happened however is that the predicted gravities may have changed and that has affected the calculated efficiencies for each batch.
The last comment in my email was relating to another issue which is the program actually reports a brewhouse efficiency as being the mash efficiency. This will change in a forthcoming point release where a mash efficiency will be exactly that....a mash efficiency. All downstream losses will not be taken into account. The reason for this error is that I was trying to take account that some people may not take their pre boil gravity and used the OG / pitching volume instead.
Anyway, I hope this makes things clear. As far as I know, the calculated gravity, color and ibu values are now all correct. The mash efficiency thing will be sorted out shortly.
Steve Flack
Kent Place Software