It turned out to be a question of permissions, specifically within the Microsoft.Net\Framework directory structure. It is baffling to me how the application ever ran without all of those permissions assigned.

Thanks,
Chris

>I posted the error message to microsoft.public.dotnet.languages.csharp. Hopefully someone there is familiar with the issue.
>
>Thanks,
>Chris
>
>>It sounds like something has gone awry with ASP.NET...I'm not sure what's going on, but if you don't get an answer here I highly recommend posting the question on one of the Microsoft news groups...I've found they're very responsive with high quality answers from both MS people and MVPs.