I have just downloaded version 1.74 and the DPS was different to my in game sheet so I took off all my gear and change my skills to non damage increasing ones and added each piece one at a time updating the spreadsheet as I went to find out where the DPS difference was coming from.
Turns out its one of my rings with a +9-30 damage on it.
Equipping the ring and adding 9 to the min damage and 30 to the max damage to the spreadsheet gives two different DPS values. (The spreadsheet is lower than the in game character sheet).
Am I entering the values wrong for + damage on a ring or have the calculations changed somewhere?
(I'm not at my gaming computer at the moment but will post more info when I am).