What happened to the categories on the left? I do not see them any longer.?

Mine have been gone since yesterday also. They have done something with the page set up. You have to click on a question, the hit the category (at the top) furthest to the left to get to the categories. You should see "All Categories" after doing this one or two times.

There are nervous fidgets at Yahoo who keep messing with the format of Yahoo Answers. It must be their hobby or something. Yahoo Answers hasn't worked correctly on my smartphone for months.