All the URL's you gave me to try work fine.

 

Yes - It works fine from my local host.  And other users can view the app running from my localhost okay too.  It only crashes when running the app from our TEST server.  It's the exact same code, I'm literally just pressing the COPY button from Visual Studio to move the site to TEST.

 

I'll try deploying to a different TEST server and URL to see if I can work out what's going on.

/Simon