Why no answer box in some questions?

Why is it some questions I go to here on Y!A don't give me any answer box at the bottom where I can write in an answer? I'm not even talking about questions that are closed which have a best answer chosen, which usually have the answer box still available. I'm talking about recent questions that have no best answer chosen and should be open for answering, but when the page is done loading there is no box at the bottom for me to click into to write an answer. Also, any questions like this also have no "Comments" link under anyone else's replies for me to click on and read comments or give one of my own. It doesn't seem to be a matter of people blocking my username because the exact same thing happens if I use one of my other accounts to go to the same question, as well as when a question is by someone who has a brand new account and that question is the first thing they've done on Y!A.

What's going on here?