This is the message I got from Intuit today. Apparently they are not going to fix the problem, because they are not understanding the issue (I guess they didn't actually read this thread as I had asked them to do). I don't need to file a Form 8606 for my inherited IRA, because I have no cost basis in this IRA. A Form 8606 was not filed in the past for my inherited IRA withdrawals.
"We appreciate your patience while we looked into your issue. After investigating the issue, we found that Retirement Plan Distributions Received from Decedents Other Than a Spouse (Form 8606): The preparation of Form 8606 from other than the taxpayer's or spouse's own IRA or Roth IRA account is not supported. If the traditional IRA has a basis, or the distribution is from a Roth IRA, then the taxable amount must be calculated manually on a Form 8606 for the decedent."
