One year the taxable state refund didnt carry over properly, another time the list of other expenses on Sch C didnt carry over...Im sure there have been other things, the taxable state refund was a biggie that affected the outcome of returns,  it transferred all returns as having used the sales tax deduction, not state taxes paid, making none of the state refunds show up as taxable....I think most of the other ones have been cosmetic or within a worksheet like the 2 yr comparison.

I have a few sample dummy returns that I use as guinea pigs each year and transfer in early to fiddle with the software..I wait until mid-late January to transfer my own in then I only transfer clients in as they come in for their appointments.