Can you do a check for me please, just in case there is something wrong in the way I'm doing things?
I've noticed that if I reply to a LQT using the More/Reply link (I don't know whether it applies to the other Reply link) the Preview option doesn't work. While for short answers I don't bother, if what I've written is more complicated I like to preview, making me re-read before posting.
Strange, i cannot reproduce your issue during typing this answer. Could it depend on the depth of the thread perhaps?
OK, testing at this level, then (I think that was the level I saw it earlier today)
No, it seems OK at the moment. Let's try another two-way on this reply set and also test from the other Reply link, to see whether it occurs elsewhere. If not, I'll have to think it's something stale in Chrome again. I do find I have to re-start Chrome occasionally.