appSettings file attribute

I've been linking to an external config file using <appSettings file="blah"> since VS 2003. I just created my first 2010 project, and I get no data from my file, nor any error. Has anybody else ran into this?

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This functionality works as expected when I point to 3.5 framework.:eek2:
Another note, if I copy the other config to the debug directory and reference it by file name it works. When I use the UNC path it doesn't. The UNC path has worked for many of my past projects. Maybe it's a 4.0 security setting somewhere?

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Tried trusting the network share where the application is saved, and the share where the config file is saved using caspol.exe, noluck. If I copy the project to my local computer, it runs as expected.