Mouse over broken for videos

Hello Support

I have a problem with my pop up window work flow for playing videos on the Site.

I am using a thing called. Image Manager Extended.

http://www.joomlacontenteditor.net/downloads/plugins/image-manager-extended

The idea is that I upload two images that act as a preview for a you tube video.

The first image just sits there and does nothing. The second appears when you roll over the image with the mouse. You ca see how this works by going here for example.

http://finalbug.net/bruce-blog

Mouse over the first image and you should see a cow! The mouse over works for me. i.e. I see the second image with cow. But when I click on the image nothing happens. I have every thing set up correctly. I can test this on an older post where I know for a fact that this used to work. eg all posts before and including that from Thursday, 27 February 2014. What should be happening is that a window pops up to play the video.

If I go here or here:
http://finalbug.net/blog/entry/375-tools-for-petabytes
http://finalbug.net/blog/entry/374-past-is-present-ken-burns

I can roll over the images and I see a little hand! When I click on the image a new tab opens and I can play the video. What should be happening is that a window pops up to play the video.

Please advise what is going wrong. I have the feeling that this breaks again and again. It would be cool to get it fixed once and for all.

thanks

Paul