We were aware of the security issues so we do upload to a temporary location, 
we then check the sizing of the images and create thumbnails and reduce the 
size to the correct size.

The weird thing is the images that do not work - are images.  If we pull the 
file down, open it in PhotoShop and re save the image and upload it back to the 
correct folder all works fine.

So using the isImage() function I am not sure if that will solve this.

Question I have is if you save an image as a CMYK format and then use CF to 
manipulate that image, will it create an issue where the browser can not render 
it correctly and place a missing image.


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