Yep, I was having a horrible time with subdomains and addon domains. Anytime I'd type in "http://myaddondomain.com/" it would say "no such user" in the video share script and things like this. It was just ugly.

The easiest solution I could come up with (rather than messing with the .htaccess) was to start over put vshare in it's own folder like http://mymaindomain.com/community

Then I put up a silent index.html redirect in the public_html folder so that http://mymaindomain.com goes directly to http://mymaindomain.com/community