I've been searching around and there are a number of posts that point to the same issue I'm having but I've not found a solution that works.
I have wordpress-heeps version 3.3.6 installed and am trying to secure my wordpress admin login (single site install).
I have my own ssl certificate and it's installed on secure.mydomain.com while my blog is located at http://www.mydomain.com.
With the plugin installed and the ssl host set to secure.mydomain.com as well as the WordPress URL set to https://secure.mydomain.com and everything works perfectly, except for post previews.
Whenever I hit the preview button or link, I get a 404. With the wordpress-https plugin disabled, the preview function works again.
Does anyone have any tips I could try?