Have you tried to clear your browser's cache and delete the cookies? A full or corrupted cache can keep TurboTax from functioning properly.
Also, this could be an issue with the number of transactions that were loaded from your 1099-B. There have been issues with the "calculator" freezing up from too many transactions in TurboTax Online. The workaround for that would be to delete and enter the transactions manually or switch to using TurboTax Desktop. Please see How do I switch from TurboTax Online to the TurboTax software?
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