How to post without losing it or locking your computer
As you have found this "auto save" or whatever it is is a mess, 1/2 the time you post you lose it.
A work around is to type up your post, then copy it to the clipboard (ctrl c), then refreash the page (f5 for a lot of people or the circle arrow in the url box), that will cause the box you typed your post into to clear (and reset or something the autosave), then just copy your post back into the box and immedialty hit submit new thread or submit post before autosave has time to autosave.