This continued issue appears to have nothing to do with ‘older’ files. I have continued to experiment with my problem. I removed ALL of my theme files from my two theme folders in apps and skins, then replaced those files with direct copies of the current updated files from the default theme into ‘MyTheme” folder.
At this point I assumed this would work, since if I change my System-configuration setting to the default theme it works perfectly. But to my surprise, even copying these correct working files into “MyTheme” folder, setting “MyTheme” as default in System-Configuration and then proceeding to attempt address changes and additions on the frontend still does not work.
Obviously at this point the problem is not will my theme files, they aren’t even loaded on my website server now. Where else should I look in my files to fix this?