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We had some custom login page HTML on SM15, and when we upgraded to SM16 it kept it (which would be expected). But it's no longer needed, and no matter what I do I can't seem to make it go away.
https://mail.mbsportsweb.ca - notice the broken image and text below the login box.
Here's the Login Display settings:
As a side-note there's another minor bug. If you enable the custom login page HTML and have something in there, changing the value of the custom HTML doesn't trigger the "save" button to become enabled - so there's no way to save the changed custom HTML without changing something else on the page.