thanks for the feedback

I guess I was not clear enough when I wrote marksight.com
I should have written:
http://marksight.com is the main URL of the website.
and
http://marksight.com/app/ is the URL of the research application.
I already have many registrants, and no one complained about any certificate issues. My guess is you had just typed https instead of http.
Hope this helps and happy holidays!
-Val