I was looking at this thread as part of due diligence before opening a new one, and now that I see the problem it describes, I'd throw in that I continue to have this problem often when I'm editing a comment. When it happens, I click [Save] before even writing, and then click [Edit] again back on my original comment, and it's gone --well, it's there but out of the way. Happened last, the day before yesterday. Now, to my new thread...