I am using the current version of Zen Cart. It was working fine a month ago. Today when I tried to access the admin configuration section, I get blank pages for ALL the pages listed under the store configuration pull down heading. I tried to install the de-bug enable error module but there were no myDEBUG files in my cache folder.

The rest of my site appears to be unaffected, but I want to make some changes and can't access any of those pages.

I have no clue what's going on as I didn't make any changes to any php files.

Any suggestions for the coding inept?