BuddyPress.org

The recent activity and recent posts just show an excerpt of the full post. Looks like you are embedding media through a plugin. WPMU strips *all* the html and other stuff from the post for the small excerpt. Also many plugins hook the the_content() call which displays the entire post. Then your plugin gets a chance to do it’s video embedding thing. Excerpts don’t call the_content() they call the_excerpt(). Different way of showing post content and not processed by the vid plugin.