There are several places in the code the reference a resource by "http://blah.blah.blah". All of these would need to be removed or changed to "https" for the messages to go away.
Just do a global search on "http://" and you will see alot of comments for the SPL (those don't matter) and a few that are actual lines outside of comments like in Accounts/DetalView there is the line
Code:
<td valign="top" class="tabDetailViewDF"><slot>
<A title='http://{WEBSITE}' href='http://{WEBSITE}'
target="_blank" class="tabDetailViewDFLink">{WEBSITE}</A>
</slot></td> I am not sure yet which ones, but some of these (not all) are causeing your problems.
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