Someone on the Flickr forum presented the answer:
"I'm not 100% sure but I think it's a combination of some slightly
dodgy scripting and the fact that you've uploaded your photos is a low
resolution. Flickr makes several sizes (square, thumbnail, small,
medium and large) of your photos available with predictable URLs, and
also makes the original size available with a different URL.
The gallery script you're using seems to be generating what would be
the predictable URL for you 'large' size, rather than actually
querying Flickr for the available sizes. That doesn't work on your
account since your 'large' size is actually your 'original', so
nothing exists at the predictable URL for large - you've only actually
got square, thumbnail, small, medium and original.
You can probably fix it by either modifying the script so that it
checks with Flickr for the URL of the largest available size for each
individual photo, or by uploading your photos in a higher resolution
so that Flickr does generate a 'large' size."
I set the 'enlarged size default' to medium and now it's working fine.
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