I assume this is the post you're talking about
:
http://thefiringline.com/forums/show...94#post4925394
There's nothing wrong with the attachment, it shows up as the image you intended it to be. I suspect you may have a virus or some form of malware that is intercepting your view of the image - that's how they work. Just to be safe you should scan your system for any such virus or spyware.