Is everyone here accepting third party cookies on PPRuNe? I know many of you are UK-based, which falls under DPA 2018/GDPR rules about autonomy in regards to cookies. I know others are in Australia and don't have that kind of issue. My suspicion is that there are multiple issues affecting YouTube embeds that people are experiencing.
Does anyone have any kind of content-blocking software (including ad blockers) that they are running?
A few things I'm noticing. Loose Rivets, your first couple samples (well one, they are the same post) have a link that I believe is just simply dead or otherwise bad. John, you're in desktop skin on mobile, which is not officially supported and tech isn't going to invest time in that. If you switch to mobile, it should be fixed.