vs 2005 - web reference issue

Hi all,

We are experiencing a strange issue with VS 2005. We are trying to add Web
References to Web Services that require Authentication. The first web
reference adds fine. It prompts for the U/P (which is saved) and everything
works fine. Now when you go to add the 2nd web reference in the same
project, it doesnt ask for the U/P and it simply fails with a COM error:-

Unable to cast COM object of type 'System.__ComObject' to interface type
'EnvDTE.IVsExtensibility'. This operation failed because the QueryInterface
call on the COM component for the interface with IID
'{3C536122-57B1-46DE-AB34-ACC524140093}' failed due to the following error:
No such interface supported (Exception from HRESULT: 0x80004002
(E_NOINTERFACE)).

However, if we start a new Project and then try to add the web reference for
the 1st time it works fine.

Any ideas?


.

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