[FIXED] "Unable to retrieve signature image dimensions"

All the images I'm trying for my signature are within the 800x200 limit yet I always get the error: "Unable to retrieve signature image dimensions, please try another image."

Is there a way around this?

EDIT: The problem seems to have gone away after the latest update to the site.

Not fixed for me. I can't add an image to my sig without it saying this message and it's under 800x200

edit: Ok, it must be when you use certain images, as some would work and some would not for me.