WordPress won't display anmated GIF

I developed an animated GIF for someone to use as a WordPress header. I know that if you provide too large an image, then the GIF is resampled as a single frame and stops animating. I reset the parameters of the largest acceptable image in Wordpress and provided an image of exactly that size. However, it still won't animate when uploaded.

Any suggestions?

The theme is "Get Noticed" although I don't believe that matters.

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