In Federal review, going over some ESPP sales, I get an error saying "Hmm, looks like we hit a slight snag in this section" every time I try to confirm my discount. Why?

Having same problem.

Please try logging completely out of the TurboTax website, then clear your browser's cache and delete cookies. A full or corrupted cache can keep TurboTax from functioning properly. If that doesn't work, try a different browser.

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I had similar problem. Problem seems to be with capturing adjusted cost basis entered in initial stock sale section. Used I'll enter myself option and reentered all the data, FMV, discounted price etc....It has worked.