I was browsing on Youtube a while ago, when I noticed that Chrome showed it as an insecure connection even though it was over HTTPS.
I'm using Ghostery and Adblock to block trackers but nothing more, I don't think it's the reason because I always blocked trackers and this never happened to me before. I don't know if it is a bug or something. I tried to inspect the page with the dev tools in Chrome, but I didn't see anything strange, just that it's a valid certificate but no HTTPS connection:
It didn't matter if went back to the main page, Chrome was still showing it as an non secure connection. Of course when I closed and re-opened Youtube the problem was gone.
Is this something insecure for cookies or they can never be sent in this case if they have an HTTPS-only flag?