The permission level of 0666 for the images in the bmz_cache folder is as it should be. No doubt you're worried about the security of the images being set at 0666 instead of 0664.
There are three reasons not to worry about this:
1. The images in the bmz_cache folder are not your original images. They are optimized copies.
2. The permission level of 0666 is necessary for IH2 to operate effectively and is perfectly secure in this instance.
3. The bmz_cache folder contains an .htaccess file for added security.
In other words, you should leave those settings alone.
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