There is a problem with embedded video on blog posts. 

The problem is that when you open up the post for editing, the embedded video link disappears.  Completely.  I had just opened Mila's latest post (on the CIA World Factbook) to fix a typo and noticed the link at the end disappeared when I opened the blog.  This had happened to me before on the Greenland post I had done earlier, so I exited without saving, found the video embedding link & saved it to clipboard.  When I then opened Mila's post I was able to just recopy in the embedding link & fix the other typo's.

I know how to work around the issue, but don't understand why it happens.  Are others experiencing this or is it just me?

It's a problem with the WYSIWYG system which filters out certain code. Haven't worked it out yet, I'm afraid, other than to turn off the WYSIWYG system when adding YouTubes.

Will do.

BTW, the online World Factbook is impressive.  I was surprised that they had posted it online a few years back.  But then, the online version is just a shell of the classified version we had available back in the 80's & 90's (ours was still hardcopy, though).