It's a 27K JPG. I don't have the pixels handy but I'm pretty sure the pixels are correct. I've been using the same picture for awhile, the one displayed below. I was trying to update my Signiture with additional information.
Maximum signature length: 255 Maximum signature links: 3 Maximum signature font size: 200% Maximum smilies per signature: 0 Maximum signature image width: 600px Maximum signature image height: 0 (Set to 0 for unlimited height.)
Allow use of [FLASH] BBCode tag in user signatures: No
I can't see anything that would stop your new sig. Would you like me to try changing it?
Same message, even using the same picture... The only way I don't get the message is to delete all but a picture. According to your limits, my image should fit. I'll have to look at it when I have more time.
It was not possible to determine the dimensions of the image.