My personal software generates a .txf file containing the whole year's worth of tax-related transactions by payee/payer. The only time I ever look at my 1099's is just to make a quick check of the .txf totals reported by my software. Errors are rare because practically all my finances, which include social security, pensions, investments, and rental income, are entirely automated.
Turbo Tax accepts this file and accumulates the individual transactions into one 1099 for each payee, which was always consistent with the original--until now. At least, this is the first time I have ever noticed a difference. Turbo Tax should round only the final total of any entry to the official IRS forms, and not before. That is what the IRS recommends, and what most people do when they fill out the forms by hand.
