Your host could be running a very strict "mod_security" which see Zen-cart as a valid program so it allows unloads but sees IH (hacker) as not a valid program so it flags the image file 600.
This maybe of help.
https://www.zen-cart.com/tutorials/i...hp?article=390
Check your [FONT=Verdana, Arial, Helvetica, sans-serif].htaccess files too.
M
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