The red "x" in the box means the computer does not know how to display
whatever should be in that box. You would need to know what kind of content
is trying to be displayed (Shockwave, Flash Player, Crystal Report viewer,
etc, etc) and install the correct plug-in to make the "x" go away and the
content to show up.
Or it could be that the website is broke and the graphics aren't there.
It's hard to say since you didn't give us much detail to go on.