When I created a new project, I used the mouse to select the scriptmap field. By using the mouse, the cursor was not at the start of the field, and I ended up with " fd" instead of "fd". This gave me all kinds of problems until I realized what I had done, and corrected the web.config file, and changed VS2010 accordingly. However, this shouldn't have happened in the first place, since the project designer should use ltrim() or alltrim() so that the empty spaces were stripped before they caused any problems.