Just to mention a few important things dealt with in Forum Video Tuturials:
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I'm still seeing AM/PM, so I think that's a preference item.
That is strange, Peter. I have never changed region (which is set to United States (default)), and the Time Zone is now reset to Pacific Time (strangely enough it was set to Mountain Time). I have always kept the (old) forum defaults.
There are a few glitches with the changeover.
I don't recall a Prefs setting for AM/PM 12/24 hour display. Can you post a screen shot?
The AM/PM or 24 hours clock is Operating System settings not forum settings AFAIK. The only settings a user can do is the timezone as shown in the picture.