Hi,
Ok after testing it seems that if you try to upload more than the limit (I think say 8mb) of photos at once it fails and in a totally unhelpful way. No useful error message or anything.
To get around this I'll look into updating the classifieds see if it gives us a useful message and try to increase the file size limit. I've a lot on at the moment though so might take some time to get to.
Thanks