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I am investigating and will add an update forum post on this in the next day or two. This was a difficult problem as the error here was different and not logged by our system.
After reading up on emails & posts on this, we're now going to prioritize a new "auto-save" feature to make sure unanticipated problems like this don't result in lost writing in the future. As that is the worst thing that can happen. My hope is it will be ready by June 15th (along with a major user interface update for the entire website).
So in the future, no matter what happens including unanticipated server outages, website bugs, spilling coffee on your computer, etc...you should be able to go back to your account and find the last auto-saved point of your writing with hopefully you losing less than a minute's worth of work.
Along with this feature will be a "draft" mode where you can write a post but not submit it. Or be able to save it and choose to submit it later.
And we have many other updates planned including a complete overhaul of the entire user interface with better help documentation to go along with the changes.
So thanks for everyone's patience with this issue. I sincerely apologize for those who have been impacted by this especially those who spent a lot of time writing posts that may not have saved due to this website bug.