I was wondering myself what happened to the experts. I spent something like two hours on the phone with them last week, but did not get a resolution. Eventually they told me someone would contact me by email by the weekend at the latest, but that did not happen. I'm disappointed; it's such a well-posed problem, you'd think they'd address it quickly once it's been pointed out.
Rather than spending another two hours on the phone I decided to do the following: Calculate the limited deductible interest manually, and then feed Turbotax modified interest payment data such that the amount on Line 8a of Schedule A comes out correctly. This of course means the worksheets are wrong, but at least the tax return will be correct. It's very annoying that this is necessary.
