This scenario has now happened multiple times while replying to a post:
I complete my reply and am sent to a Capcha screen which requires a check mark. After entering it the screen goes blank and into a "processing" mode for about a minute then halts in place. There are no instructions telling me where to go now.
If I then hit "return" to go back to my post I am sent to the last previous post on that thread and mine has disappeared. If I restart RD and do a search for my post it is gone.