There are several elements on pages not served over https, viewable through: http://view-source:https://www.gpugrid.net/forum_thread.php?id=4662#48311

e.g. Twitter and Facebook header buttons.

It is causing warnings (yellow SSL lock in address bar) and left unchecked could lead to site vandalism, or possibly greater security risks. AFAIK.

Mitigation process outlined here: https://ravenousravendesign.com/code/use-ssl-properly-avoid-yellow-lock-symbol/

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