For anyone crazy enough to still be following this I have a (partial) solution.
I have previously had Firefox set as my default browser.
I knew that this would cause my site to launch in firefox and therfore I
have been using the "start external program" facility.
With Firefox set to my default browser this fails to enable debugging even
with a subsequent "attach to" applied to the correct instance of IE
-------------------------------------------------------------
Start external program : C:\Program Files\Internet Explorer\iexplore.exe
Command line arguments:
http://localhost/WebApplication2/default.aspx
-------------------------------------------------------------
Setting IE to the default browser causes it all to work....
But I want to use Firefox so this is only a partial solution..
The question remains....What does VS do differently in these 2 cases that
I might be able to simulate using the "Start external program" feature?
--
Rory