[Wordpress issuses] oxmark on ""Only secure content is displayed" in admin pages"

I keep getting this message each and every time I am logged in, if not, it is OK, it is really annoying.

Reading the the forums, I have disabled all IE extensions, set admin to https, http: etc logged in out and stopped and restarted, but NOTHING will make it go away. Going through IE settings nothing looks obvisously wrong.

Could it have something to do with DNS as I have mappings to :

http://www.headingtonheritage.org, org.uk, and the internal wordpress one?

Many thanks

The blog I need help with is headingtonheritage.org.

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