Some of you might have noticed when adding a subdomain, only the most newly added is listed. This seems to be a bug with Cpanel 11 from what we can tell, and right now we can't do anything about it without downgrading to Cpanel10 (which wouldn't work out too good). We'll try to keep you posted.
Update: A bug report has been submitted to CPanel, we hope it makes it into builds over the next day or two (it's been marked as confirmed).