Youtube thumbnails don't show in Aggregator

Hi everyone,

I'm sorry if this was discussed already, I couldn't find any posts that answered the following question:

I have created a youtube rss and added it to aggregator. In IE it shows thumbnails of the videos but not on any of my drupal pages.

The feed I use is this one: http://gdata.youtube.com/feeds/base/videos/-/office?client=ytapi-youtube...

Open it in IE and it looks just as it should.

Does anyone have an approach to this that will solve the issue? Or perhaps someone can point me to the post that deals with this and I have missed? Please don't forget to yell at me for missing it ;)