Copy your answer Refresh the page IF you are on mobile platform, scroll to the bottom of the page and click the desktop button. I tried this on a kindle tablet recently, and there was no "Desktop button, but i did NOT try to post an answer to a question. I did not have have any problems with the Yahoo itself. "Sricky" buttons are a common problem , so you are not the only one.
Cubs Nation is right. I've had the same thing happen and it's always been because the question has been deleted. Do a refresh and see what the message is.
Try to refresh the page because this site still has many glitches and Yahoo! Will soon fix them
sometimes you have to keep clicking until it goes thru another reason is they deleted there question