This happens when someone adds a photo as an attachment. To me this is very annoying and I think lazy. People should upload their photos into thier album and them add a link to the image when they post. This would display the photo properly. Also this allows your photos to be located in your album so that everyone can view them at once. When you add photos as attachments they do not get placed in your photo album and are only tied to the post that you attached them to.
With the new forum program there are several ways to display photos.
Here is what I think is the proper way. This is when you place the photo in your album and then link it in your post as an image.

Here is a way that I have been seeing some people use lately. You have to click on the picture to see a larger version of it. This is still annoying to me, but I can see the benifits of not having to load the full size image when you are more interested in just reading the post.

And this is when someone adds the photo as an attachment. When the photo is larger you will get the scroll bars. You can get rid of the scroll bars by clicking once on the picture and that will enlarge the picture to full size, but this to me is the most annoying way of posting a photo.

- coleman 200a.jpg (23.93 KiB) Viewed 1756 times
That is my opinion though, so do what you wish.
Dan