IE Problems with embedded video objects (youtobe ...)

Hallo,
I have a very nasty and bad bug with IE 7 that prevents the ape from loading giving a nasty error on a pop up and a following error page. The problems is there only for all the pages with embedded video such as youtube.
With Firefox there is absolutely no problem.
What makes me even more crazy is that the first time the page opens in both browsers but with IE if you close the Window and try to load again the page (not a refresh) this will always give you this error.

This is a page to look at the problem:
http://www.pharmainfo.net/campus-news/drbsuresh-commitment-and-passion-p...

With the other themes this error is not happening.
Thanks for any help you could give.