Okay guys, I just added an s at the end of any http fields in the Content Rebuilder > Custom Tag Editor > Custom Tag List: YouTube Video and ran a rebuild on posts and it's working now!

SSL/HTTPS YouTube Embedded Fix

User Prompt Hint From Text Editor:
YouTube ID; eg: xxxxxxxxxx (or https://www.youtube.com/watch?v=xxxxxxxxxx)

Resulting Markup:
<object width="425" height="350">
 <param name="movie" value="https://www.youtube.com/v/\\2"></param>
 <param name="wmode" value="transparent"></param>
 <embed src="https://www.youtube.com/v/\\2"
  type="application/x-shockwave-flash" wmode="transparent"
  width="425" height="350">

Thanks for informing of the Custom Tag Editor, very useful!

Thank you smile