Sorry about that - I tried replying to see if it was working for me. Unfortunately I then fell asleep before getting round to a follow up that might have been helpful, or might just have taken the piss a bit
Just upgraded my iPad to iOS 13.1.2 (possibly the worst ever rehash of iOS) and the the floating button to reply to selected text in somebody's post has stopped working unless it is repeatedly pounded.
On another site with the very same feature it works ok as does the main reply button (the one next to the like button) on this site.
I am beginning to hate Apple products but I am not sure it is an Apple problem this time. God knows, it has enough problems without ArRSe adding to them.