I spent a long time writing the answer I found to a question that I asked and only after I hit submit, I got this:
Oops! Your answer couldn't be submitted because: New users can't answer their own question for 8 hours. Please use comments, or edit your question instead.
Besides that fact that my privileges page shows that I am not a new user, why is there no warning about this beforehand?
The third thing from the bottom of stackoverflow.com/privileges (when I go to it) is
Separately, do I need to do something to have the restriction-removal take effect? There is no documentation that I could find that says that.