Hmmm that is damn strange - when the pages loads I usually get all six, then a refresh usually shows four, another refresh shows just two then a final refresh shows a 403 error! There is something very unusual going on there - I'm asking some people I know to see if we can figure out what it might be, but to me it looks like a server issue - but if I find anything out I will let you know.
I would suggest trying 4 images again and see what happens - if that works then it might be worth sticking with that.
Cheers
Jason
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