Embedding looks to be working now, but you have to use the full URL, not the shortened "share" URL.
Looking into how to fix the prior posts...

Editing the post which contained a video and re-submitting should re-enable the video.
Copying and pasting the entire youtube embed code, and removing the old line, definitely causes the video to render again. Let me know if you continue to have issues.

Also - you'll see there's now a box with "youtube" in the middle of it above the post creation window - click that, and in between the two tags, insert the long youtube URL.

Looks good Ian. Thank you!