YouTube causing errors

Hey,

I’m having an issue (has been an issue on all my themes, I have had made) so must be a WP issue or something I’m doing wrong.

I always use YouTube videos in my post by copying the URL into the post. However, I can never seem to get them to center properly. I use the align middle button then paste the link, doesn’t work. I put center HTML tags around the video on text editor, doesn’t work.

Any reason and solution for this?

Also I’m having some title errors if someone could help me out: http://wordpress.org/support/topic/title-errors-2?replies=3