While not perhaps an ideal solution, I believe I can give you a workaround to assist you in getting your return completed and filed. You should request, if you do not already have one, Form 8949 from the issuing agency. The 8949 is what you might call a summary of all transactions form. Delete all imported transactions if you have made any successfully, and enter the totals as a single transaction as shown on the 8949. There are separate sections for short-term and long-term transactions.
You may want to attach a pdf copy of the 8949 to your return for verification purposes. Attaching a pdf to your return may make you manually complete Form 8453 and submit that form with the pdf of the 8949.
The IRS is concerned that you are properly reporting your total capital transactions with their associated cost basis and while individual transactions are important, the totals are the most important.
Form 8453
Form 8949
Form 8949 Instructions
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