Visual Studio Team Edition for Database Professionals 'The selected database is not supported' Error

I tried to 'Import Database Schema..' from a SQL 2005 project, I added a new connection.

When I clicked on OK, I got the following error. 'The selected database is not supported.'
(I was connecting to a standard SQL 2005 database...nothing special about it)

I asked our Microsoft contact; James Snape.

He suggested trying to manually add a new database connection from the Server Explorer. This didn't work!! But I did get a different error, 'Key not valid for use in specified state.'.

The solution was: deleted all the Data Connections I had, then add a new one.