I've discovered when a user includes an image like on http://www.digitalt.tv/forum/topic.asp?TOPIC_ID=2809 the width of the site expands when viewed in Internet Explorer. Mozilla and Safari seems ok. Since the picture is not so wide that this should happen I don't understand why it does. Can anybody here explain why?
I didn't notice a difference here at work with either Fx 2 or IE6...
Are you asking about an image that a forum member has included in a post/signature/something or are you talking about the ad on the right and/or the header stuff?
Update. Ok must be the admin buttons that does it. So only I'm going to see it. Not really an issue then for regular users. So no cause for alarm then.
I just checked in IE7, and I'm still not seeing it. Depending on how you set up the header, it should still stretch with the rest of the page... but if you're ok with it, then no need for concern.
As a side note, I've found the IE Developer's Toolbar and the Web Developer's Toolbar (for IE and Fx respectively) to be indispensable in troubleshooting things like this. Even if you don't use them to work on this problem, I'd download them for future use.