I don't see a padlock of any sort yet, nor the logo, see screenshot. I have never seen a coloured padlock, black only on any website I have ever visited.
I have cleared history, which is what I assume you mean by 'clearing cache', terminology varies form system to system... I used Andrea's link
https://nikongear.net/revival and saved it in my bookmarks, I almost never shut my computer down and have a dedicated window for my regularly visited/current interest photography sites, which are accessed via tabs within that window.
I am running Mac OS 10.14.5 and the latest Safari on a 2014 iMac.
I just checked my iPhone (6s) ensuring I was using the correct https url and the logo is present but no padlock.
May I add my appreciation and thanks for the efforts to update the forum and keep it running smoothly.
