Hi Ken,

I'll put comments in colour in your last reply.

Ken Grierson wrote:
 

Roger;

Let's deal with the fatal error issue first and see what issues remain after the sites are up and running. Fine.

From the error message you posted you have some sort of Trust issue going on with the site.

Are you on a Hosting provider?  No, the site(s) are hosted on a Windows 2008 R2 server within my own network which has a public IP address assigned.

What Trust level do they operate at for .Net sites? I don't know the answer because I'm not familiar with this.

What is the trust setting in the web.config files?   The line, that you referred to,  in my web.config reads:   <trust level="Medium" originUrl=".*" />

I'm thinking the way you did the copy did not merge the web.config files so you've ended up with a default web.config setup.  Copying the "upgrade" files to my site folder didn't overwrite the web.config file and I didn't make any changes myself.

I think you need to reconcile the web.config Trust settings between your 5.2.2 site web.config settings; the upgraded 5.2.3 web.config settings and what your hosting provider allows for Trust.  I didn't change anything in the web.config file.

I don't know if that helps?

Roger.