Deductions & credits

I'm jumping on this thread because I have the very same issue: I refinanced my mortgage and TT incorrectly adds the balances of the old and new (refinanced) mortgage together, making the total appear double and thus limiting my deduction incorrectly.

I noticed another error. TT Online has the "explain why" link that appears. 

It gives the cryptic error that this newly calculated mortgage interest "is the same as HP3L12 because true."

I can only imagine that the flawed algorithm that's used to come up with this value is also flawed in its reporting.

I tried contacting customer support about this, who was baffled, but could not provide an answer. Worse, they suggested that I upgrade to the "Tax Live" version to solve it. That's not what I want. I know the problem. I just want the software fixed.

Many of the workarounds require editing the worksheet. Does anyone know whether this is possible on the online version? I made the mistake of not purchasing the desktop version.