Just tried it using AWeb II. It works, but takes ages to render the page. Possibly due to the way AWeb handles GIFs, etc. However, I did notice that the disk icons are animated (had I checked the site using my Mac I would have seen this!). This doesn't happen in IBrowse, oddly. But it's not too important.
wrt Pssst - I have downloaded the A500 version, but it is the A1200 version that throws a 404 Not Found error.
I'm off to look for some decent GIF datatypes for IBrowse now
EDIT: Easy fix - swapping the GIF rendering to 'Internal' shows GIFAnims as they should be