I have found out that DivX Plugin crashes in IE8. The problem is discussed here too Hello,
http://drupal.org/node/1038058.
When you press to open a modal window (lightbox etc) the tagName is null and javascript crashes! DivX Plugin try to inject jquery code which replaces flash video to html5 video and this code creates this error. Unfortunately haven't found a solution for this...
Have you something to sugggest? Maybe a way to either plugin to run programmatically?
Thanks a lot.