The only thing I can offer off the top of my head this morning is to be sure whether you're using the advanced HTML editor in either or both WP and BA. I've had a few problems with losing something in a post (pic, video) after editing that post and I'm pretty sure it had something to do with the advanced editing features, and usually that means I was using the advanced editor but acting like I was editing plain text. You might try editing a post both ways and see what changes for you.
HTH a little.
