I've tried to change my sig to an image that is within the required file size and dimensions but when I change it, it says "Unable to save image." I've tried uploading the file from my computer and from host sites. And it's not just one image that it won't take, and I've got it to work before. Can anyone help me with this?

Edit: Well, this is embarrassing. But does anyone know why it says it's unable to load image?

The functionality to upload a sig is broken on the forums. To get a sig to appear, follow the steps in this thread (Thread 75523).