Illegal Operation in Plugin

Hi group,

Using Mozilla I have resently started to recive the following
"warning" window when downloading the website for a Swedish newspaper.
For the ads on the site they use a lot of Flash animations.

<message>
Shockwave Flash
The plugin performed an illegal operation. You are strongly adviced to
restart Navigator.
</message>

The URL (if you like to take a look) is http://www.aftonbladet.se/

This "illegal operation" has not happended before on this website and
even now don't happening on any other sites with (less) Flash
animations I visit. So I guess it's one of the animations that have
some errors, but it don't occur when I use Internet Explorer on the site.

Just out of curiosity, have anybody else experienced anything like
this? What can happen if I don't restart Mozilla Navigator?

--
/Arne from Sweden