I really don't want to bother Imar, so if anybody can help me that would be great as well.
OK I completed the exercise on page 229 successfully and viewed the 2 themes. The problem started on page 239 when I added the drop down list. It won't switch.
AutoPostBack is on, I see the page refresh, and I hit PF5 anyway just in case.
I see themes applied inside the <head> tags. I'm getting the same results in IE and FireFox, I never change cookie settings.
To eliminate the possibility of a syntax error in Frontend.master.cs I copied the code from the download. I got the same results.
The default setting is working correctly, so I assume Web.config is correct.
I'm quite new at this, if you can point me in the proper direction I'd be grateful. I guess I will read Chapter 18 next.