I'm not sure exactly what I did to bring this problem about. I had recently opened and edited a handout by attempting to re-upload an image (one unrelated to the page with this broken map). I had recently plugged in a LAN cable while still remaining connected to wireless.
The attached file shows what used to be a map I had made for a moving labyrinth. Now, all of the textures are gone, replaced by 'broken image' signs.
I'm using Chrome 18.0.1025.168 m on a Windows 7 machine.