What release are you using? Is it 9.0? Our quantile computations changed in the past few releases and this is one of the side effects.
We are working on a maintenance release fix for 9.0.
Thank you for getting back so quickly. I used the same dataset in both a 9.1 trial and 8.3. Will the release recalculate the quartiles? Until then, what is the net affect on a dataset with thousands of rows? Thanks again.