.... Hmm, that is interesting. I just sent in a file to them to look into for the same reason. My first harvest with a yield monitor(Loup) and I kept having trouble getting proper yields in the program. Soybeans were no problem and corn & soy acreage were ok. But when entering my job properties with the correct yield, my enterprises always showed exactly 4.39% less bu. than actual. I thought it was only a problem in one field which I had trouble getting the job accurate, but after talking with support I started getting curious and double checked all my fields.

     What is curious to me also, is both our yields were off by a close %age although with your acreage being affected, perhaps you have a different glitch. What version do you have? I have the 2009.3.3