Re 6, have a look at thesefivesuccessivescreenshots. I should have said explicitly that this happens when the comment area is at the bottom of your browser window.
[EDITED to add:] That apparently-empty-comment thing happened again with this one, and after something like 30 seconds of waiting the comment still appeared empty. I’ll see whether it’s quicker after an edit.
[EDITED to add:] Yes, it’s quicker: about 10 seconds. Might just be coincidence, of course.
Re 6, have a look at these five successive screen shots. I should have said explicitly that this happens when the comment area is at the bottom of your browser window.
[EDITED to add:] That apparently-empty-comment thing happened again with this one, and after something like 30 seconds of waiting the comment still appeared empty. I’ll see whether it’s quicker after an edit.
[EDITED to add:] Yes, it’s quicker: about 10 seconds. Might just be coincidence, of course.