For me the image at the top-left of the page (of the dog catching the frisbee and the puppies) does not load properly (Firefox, Windows 8). I suspect it may have something to do with it being a .TIFF, since it loads fine on my iPhone. Just letting you know.
oh - forgot about this. I'll try to get it fixed tonight. edit - failed; there is a ticket on it now. Waiting...
Cool. I'm not sure why this software doesn't support tiff, but it's a good thing to know. Thank you all for your help.