This isn't an IRS issue; it is a ProSeries issue.  The rejection notice does make it sound like it is IRS but this is what is going on.

There is a problem with the calculation of the taxable portion of an IRA when there is also an inherited IRA.  Specifically, the program is including the amount of the inherited IRA distribution on line 7 of Form 8606.  This is causing a larger than allowed basis recovery.  Apparently, ProSeries is holding returns that include Form 8606 until this is fixed.  All my returns with Form 8606 got this rejection and I had no idea until I actually worked on one with an inherited IRA.  It looked funny to me and I compared it with last year and immediately saw the problem.