Is the Admin footer text in White and your background is white? Try selecting over it.
Also check your footer in the template to see if there is something conflicting with the Admin html.
I worked with Jess at the time (we're now at different companies) and we found out that there was conflicting HTML that removed the footer due to copying snippets of code directly into the email editor in a hurry. Thankfully, there was minimal fallout.
Since then, testing the unsubscribe link has been part of my campaign checklist. My rule of thumb, if it's not on the test, then it doesn't exist.