The wide screen display is in most cases being caused by one of two things:
1) a single large image being included in a signature or the thread that is wider than 400 pixels; or
2) multiple smaller images being included side by side in a signature or the thread whose total width exceeds 400 pixels.
In the thread you reference it appeared that daveb12's signature images were causing the problem. I've contacted him about stacking the images in his signature so future posts wouldn't be a problem. But past posts would continue cause a wide screen until smaller versions of his images are put in place. So I gave him an assist and resized the images which should take care of the wide display in those threads where he had the dual images.
A general reminder:
ANY image included for display in a signature or forum thread
should not exceed 400 pixels in width as they will cause page display issues like you encountered and cause long page loading times for those members who do not have high speed internet connectivity available to them.
If anyone needs help resizing images just ask any moderator. They'll be happy to assist you.
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Jim Olson
"The Toys"...!!! Save the Wave!
Where I've been in a Corvette...!!!