No matter how much I resize, it always tells me my image is too tall. I have it at a size where you can barely read it, still too tall. Am I missing something?

On the billboards page it says the size and file formats:

Banner size is 480x90 and we accept jpg, png and gif formats.

I always make sure my billboards/banners are that size and haven't had a problem yet.

thanks. I'm not sure why I didn't see that.