OS: Windows 7 Professional
Browser: IE8 in compatibility mode (=IE7)
I opened the page with demos (http://www.no-margin-for-errors.com/projects/prettyphoto-jquery-lightbox-clone/) and clicked every demo on it using IE8 in compatibility mode. I noticed that when I clicked on External sites no 3, Twitter, it opened the twitter.com page instead of an iframe on the demo page. Afterwards when I clicked another external site demo it opened twitter.com again. After reloading the demo page it worked again, until i clicked the twitter demo link. The same thing happened in IE6 (IE6 in IETester).
Is it a bug or something in the demo page code?
The page says it works in IE6+...
All other media, like image gallery, youtube and inline, works fine.