Quote Originally Posted by mc12345678 View Post
I'll also try to take a look at how images are prepped for saving when using ZC 1.5.4 to see if there is anything further, but really my suggestiion in keeping with good filenaming principles, is that the file itself should be stored in all lowercase, no spaces, be named uniquely (folder(s) used as necessary) so that don't overwrite another image or have an image appear as an extra image to another product (see applicable FAQ for images). Then the EP4 file should contain the matching information for the main product image. All subsequent additional images will display as setup for your cart.
So I dug a bit into the code for a default zc install and didn't see anything that renamed a file to be all lowercase. It toys with it for comparisons against strings, but didn't see anything that modifies the string...

What did you discover with the test/process used? I know I tried to access the problem images using all lowercase letters and the server responded that the file wasn't there, so also wondering if there is something else installed or otherwise affecting the process (other plugins). Because IH4 is activated and uses the older hash function, I am not able to tell how your previous images were identified to offer further review/comment.