I am trying to set an image to my signature that points to an external url image file that is located here.
http://tonto.ulmb.com/img.jpg
It is an image created by libgd and is constantly updated, and will always be 500 x 90 px and ~15 Kb. I can lessen these params even further, but it is no use, and I always recieve this 'invalid file' problem from my signature.
Does anyone know why this could be happening?
Invision Forums allow the image, but this vBulletin is a little stubborn.