I'm sorry to hear that your email reverted back to an earlier version. I understand how important it is for your work to save properly. I see that you had sent out an email after this post, so I hope you were able to recover your work. If you lose something that is saved again, try hitting the "Undo" or "Redo" options at the top of your email. Sometimes the editor can be jumpy and delete something, but these buttons can definitely save the day. I hope this helps. Please let us know if it happens again.