Getting a "An error occurred while saving values to the app.config file." message

The content of the title is just part of the message I get. The second line of the message is: "The file might be corrupted or contain invalid XML."

I work with a lot of usercontrol libraries, and each one has 1 or 2 connection strings setup, and nothing else. I have no trouble in the code itself using the settings. Nor do I have trouble during runtime with them. But I do have the problem with every single library I work on.

The problem occurs when I make a change to the settings in the VS IDE (2005), which I do whenever I need to the connection string to point to my test SQL server, or need to set it back to the production SQL server. The connection strings were setup in the Settings tab of the Property page for the application.

I get the error message whenever I select the settings tab and again when I go to save it. I once tried deleting the app.config file, and recreating the settings, and the message went away until I checked it in. No one else has the problem when they get the files, but when I get then, I get the error message.

Any ideas what may be causing this. My boss thouight it might be an addon from CodeSMART, but I uninstalled it to see if the errors would go away and it didn't.

Thanks.

Marshall

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Marshall Youngblood