Hi Alex! First, thank you so much for your videos! I've just finished the 101 and now the Git-GitHub. I learned a lot from them, your way of passing the information is really good, and I'll watch the premium later these days.
Getting back to the post, I put the
flush_rewrite_rules() as demonstred on the codex but no lucky, it is still going to an "Page not found". I took off everything relative to taxonomy and custom post type, also no luck, but at least I guess that is not related to the problem.