If you're editing a page and you fail the CAPTCHA or your session expires, your whole edit is lost. Most users expect their browser to have saved the form data, many would know enough to log back in then hit the back button to get back to the form (or at least, hit "back" and copy the data for later pasting after login). This does not work - after a "back" the form is empty!
I'm ranking this bug as priority 7 because it is very serious - data loss and angry users. I think the solution is trivial, too: see below.
Here's a page on how they fixed this on drupal. Trivial!:
Another, even better solution would mean keeping the user's data for them, giving them a login, then sending them back to the form with the data filled back in for them. Or at least, giving them the data on the error page with instruction on how to copy/paste:
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