I had this same error occur and your advice worked. I had a mortgage that was sold/serviced by a new bank and simply needed to enter 0 in Box 2 for the first bank/mortgage company (Box 2 is the amount left to pay off the home, which is 0 since it was paid off by the second bank that took over the mortgage). I dont think its a bug, as just an understanding of when you need to enter (either turbo tax or mortgage company should prompt or fix what is in Box 2 on the 1098)
