Missing image after upgrade

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I upgraded to 5.6.0.1 this morning, and then noticed an image was missing from my theme. (See attached.) The HTML is correct, the image is on the server, the CSS is correct. I can even right-click the space and save the image, yet I can't actually SEE it. (It's very puzzling!) Nothing else changed apart from doing the upgrade.

Any ideas?

(URL:http://www.morgancc.edu)

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