I had a similar problem. My e-filing was prevented by an "invalid" CUSIP" for a money market account on a 1099-INT imported from my investment firm. I've received interest from the account for several years and never encountered this problem. Based on this post, and others, deleting the CUSIP number allowed the e-file to complete. However, I did some additional research. I had saved my tax preview to a PDF the day before e-filing, and box 14 on the 1099-INT form in the PDF was empty, which seems to indicate it was being populated during the e-file process. If true, it seems like a significant bug, because the e-file process should not be detecting (or creating) errors, especially errors in the tax forms, after the final review has been performed.
