I haven’t used WP in a while and when I wished to insert a YouTube movie into a post or page I found it didn’t work. Then I remembered that Internet Explorer does not let you insert the video, that is, the insert video button does not appear.
Firefox browser works great here. Log into your WP account with Firefox and uploading is a breeze to your post of page. Now the ‘Insert into Post’ button appears. Sure, everyone know this but I didn’t at first until a webmaster friend asked me what browser I’m using. He sympathized that I will still using IE. I still use IE because I like it but I also use Firefox and Safari.