Originally posted by Forest9
Have you turned off "back ground images" in your browser? Unlikely, but a legacy bandwidth saving option that you may have turned on accidentally?
Can you see the main "Jumbotron" image on the home page?
As stated above, refreshing your cache is the best thing to try. On Windows, hold down the Ctrl key, then press f5 when viewing the blank board.
On Mac, Cmd + R .