Apologies for the posting above being actually 1/2 of what I wrote! I don't know why the link and second paragraph didn't get stored away, but I've restored it to my original intentions and it appears to be okay at the moment.
I've noticed this behavior repeatedly since the site software update, and posted about it in that thread as a possible bug. It is frustrating, and if it happens, I typically don't bother to re-type my post, instead deleting the partial post and moving on...
<snip> Hopefully Stu can pry free a little time to look into it.