I have confirmed using both the latest versions of Firefox or Comodo
Ice Dragon and ver 22(latest version) videos do work. This also using
win7
Apparently older versions since the change to html5 by youtube will
not work on the forum. Going to youtube itself allows viewing.
If you right click the video, the bottom line will tell you html5 on both video here and at youtube.
Thanks to all who supplied information for tracking down.
Gary