ENOTSUP using Grunt

I’m using Grunt to minify and concatenate files for an AngularJS web application. Our source is on a file share and I’m connecting to it via a mapped drive. Whenever Grunt runs over my source directory, I get an error on one of my concat tasks. The error is “ENOTSUP, operation not supported on socket”. If I copy the source, local, Grunt runs, fine. For the sake of our source control, I need Grunt to watch and run over the mapped drive. The concat task uses grunt-contrib-concat. I’ve tried reinstalling Node and rolling back grunt-contrib-concat to version 0.4.0. That didn’t work. Any help/ideas would be greatly appreciated.