No it hasn't.  Set the size to 400 x 125 pixels and less than 75kb file size.
We feel, that with increasing amounts of posts on the forums, its
important to make sure posted content is not distracted in any way.
With the every growing popularity with signature images on forums these
days its important that these do not take over. Therefore we have
enforced a limit of sizes for signature pictures, this is to help keep
the forums looking clean and tidy.
Images: 1 image only, 400 X 125 pixel limit and file size not exceeding 75kb (click for example)
Text: No more than three lines of text of any font size. For text of font size 12 and above there is a one-line limit.
Any images observed to be over the limit will be removed. With exception to Tickerfactory.com images placed in Signatures, which aid forum events promotion etc.