it's because some changes have been made at the YouTube site, and the browser link that you used to be able to copy and paste might be too long to embed.
In order to embed your video, click "Share" under the video, and copy and paste the blue-highlighted link that appears.
View media item 135518
View media item 135519
In order to embed your video, click "Share" under the video, and copy and paste the blue-highlighted link that appears.
View media item 135518
View media item 135519
