I have started to get the 'Not private' or 'not trusted' error message whilst trying to open files in a shared folder in google drive. I get it in all browsers and I get it with an incognito window in chrome. I only get it with one computer (imac OS10.9.5) and I can see them fine on other Macs. It therefore seems to be a prob with this one computer. The time and date are correct and it only seems to be with shared files and, so far, only with G.Drive. I have refreshed and re downloaded browsers and removed caches and cookies - no effect. looks like a security problem with this one computer.