Starting a few weeks ago, when I compose an e-mail, if I press backspace to delete a character, or if I highlight some text to delete and then press Delete, my entire draft e-mail vanishes. Right-clicking and choosing Undo doesn't retrieve it. This is really frustrating, especially if it's a lengthy e-mail that I've put some time into. Can anyone help?
Try clearing out your browser's cache/browsing history. When you have done that, close out the browser and re-start it in a fresh session. But if it happens again, while still in the Compose page, hit Cntrl-z on the keyboard.