Embedded Video Not Working in HTML Editor

I am trying to embed a video with embed code in the HTML editor and it is strange as it works on some 2.9.1 client WP sites but not others. An embed code from YouTube works fine on all WP sites but a longer embed code from Veeple.com only works on some sites, not others. On the sites where the longer embed code does not work it will allow the embed code to be pasted, but there is a blank space on the page where the video would be and there is no embed code when looking at the page source code. Any help would be greatly appreciated.

Thanks!

Doug