Web Apps

Interesting, I viewed this post using a different account and different install directory. The banner image (which I've never seen using that account/directory) is current. Viewed using this account/directory, the image is still from last December. If each client is caching the images for ingame display, how do we force the image cache to clear? What's more, if each client is downloading the images (which would make more sense) why aren't the images downloaded/refreshed every time like a typical web browser would?