Thank you for your reply. However, the issue appears to have been a software bug. The error and inability to file appeared after a Turbotax software update and disappeared two updates later! Prior to that last update, a Turbotax live CPA found no issues with my entries, entered a bug report, and allegedly sent a notification to the ?Turbotax app to run a diagnostic. However, no notifications were found when I clicked on the "bell" icon in Turbotax! I had been using Turbotax without issue for weeks, so I suspect that the update was just wonky. Took the Turbo out of the Turbotax for sure! Also a bit frightening, as in the end, it seems that Turbotax mistook an entry of $300 for $300,000!
