I recently changed a few things around on my Zen Cart installation to turn on SSL and everything seems to be working fine but now newly uploaded images don't show up.

Trying to go directly to the URL of a new images gets a 401 unauthorized error. When I go and look at the new images on the server (its a windows 2008 server with iis 7.5) the new images are written with all permissions turned off. If I turn permissions back on for IIS_IUSRS the images show up again. How can I get Zen Cart to upload images with the correct permissions so that people can actually see them? The images folder is has all permissions enabled so that's not the issue. What is going on here?