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I've had a gander at www.iis_resources.com. Looks like a good resource to have for IIS users.
My phpMyAdmin site runs flawless, and both site are configured with the same permissions atm. All sites in my root directory inheret their permission from the root directory. I have set the value for http_referer request to true, but no luck. However, I'll move this server outside my firewall and see what happens.
DOH!!! That's what I get for staring at these configs for so long. However, I do have PHP debugging enbabled via the php.ini and common.php file, and am able to generate visible errors at will. Just nothing comes up when I correct whatever change I made.
Thanks for the suggestions. If anything this helps me to solidify that I'm not losing it, and have been following sound troubleshooting steps.