Ok so I went back through and fixed this for myself. It came from problems with sales/transactions with cost basis not reported to the IRS. Here are the steps:
1. Delete the offending 1099-B.
2. Re-import.
3. Select "My 1099-B has info that I know isn't right"
4. Edit the transactions to add the proper acquisition date and cost basis, but DO NOT edit the dropdown box (even though it is red) that has something like "Transaction Type." Leave it blank. Turbotax will not complain and the error will go away on the check.
