Again, thanks Wrox for creating this forum for us.

I encountered an error and spent about three hours trying to resolve it before realizing it was my fault. I'm posting this here so that others might learn from the experience.

Background:
I downloaded the files related to the hidden frame GET example in the book. Everything worked fine. I decided to use them as the basis for some further learning so I copied them to a new directory under htdocs in the Apache http server directory. I tried running the application but data from the database did not display. Furthermore, in the lower right corner of my browswer, the "Unknown Zone (Mixed)" status appeared. I tried all sorts of solutions like messing with security settings within IE and the folders themselves, then I checked the Apache error log. It indicated a missing PHP file.

I copied the file to the new folder and the "Unknown Zone (Mixed)" status went away and everything worked fine.

Lessons learned:

• "Unknown Zone (Mixed)" status can be very misleading.
• Check your server logs early on in your troubleshooting process.
• Be smarter than me and make sure you have all needed files.

Hope everyone can learn something from this.

Thanks. I had exactly the same problem. One minor file was missing and that is why I kept getting this message. Thanks for the fix. (: