Sig Image Issues (Bug?)

[taylor_smith]

One of my users is trying to use a signature image. He has uploaded a .gif to my forums, but the signature will not show up. I confirmed the following:

1) The signature meets the size requirements
2) His usergroup is allowed to use signatures
3) His profile is set to display signatures

I was also unable to make the .gif work. It shows up in the ACP as his signature, but it will not show on forums. I saved the image to my desktop, renamed it, resized it, and converted it to a .jpg, then uploaded the new .jpg via the ACP. It revered to the original .gif. I tried using the forum-hosted .jpg link between two img tags--it didn't work. I uploaded an entirely different signature--it showed up in the ACP, but not on forums. I uploaded the .jpg to Photobucket and used the link--it reverted to the original .gif.

Another member suggested that, if I changed only the extensions and not the format, vB may be renaming the file to the correct extension for the format. However, this would not explain why a Photobucket-hosted image would revert to the original image.

Anyone know what I am doing wrong or how to repair this issue?