This format really is terrible !! I have just tried to answer three questions and can not get into any of them. Come on the AB Editor - wake up and get it sorted before we all leave you !!
Hi- this just happened to me when I wanted to answer a question but there was no Post An Answer tab. I think this must happen when the person who asks the question clicks on the 'close this thread' option.
I'm getting used to the new format now- it looks a little bit more like the old format as each day passes- but I think the number of posters has fallen on some sections , particularly Business and Finance, so some have voted with their feet maybe.
Can I just confirm that when the OP decides to Close This Thread the Post An Answer option does indeed disappear (I've just done it on one of my own questions)