You have me stumped. The software we use, phpBB2, sets its tables to 100% of your browser screen automatically. That is, unless there is an image that is too large.
Please check your display settings. What browser are you using?
I believe you should no longer have to scroll right when using 800x600 resolution in the post view. You will have a few pixels to the right in the index page and a few more in the portal page.
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