I made some changes in the admin area, saved and then I got the usual This page cannot be displayed error.

So I restarted the app and then I could no longer login or get to the admin area due to getting the same error, which is no error so isn't very helpful!

I even tried turning errors on in the web.config file with this:

<customErrors mode="Off">
    </customErrors>

But still it refuses to tell me what the problem is.

I thought it may be related to something I had changed, so I tried pointing it at the default demo db but it still had the same problem so that eliminates the db or any setting in it.

I didnt change any code to break it so that only leaves the VS 2010 built in web server or IIS, but again I didn't change anything.

So why on earth would it just stop working?

I was hoping maybe someone has seen this before and hopefully knows how to resolve this?

At this rate I will be forced to re-install noCommerce but I really don't want to do this, and it may not even solve the problem...

Cheers.
David.