My Win7 HTPC is networked and a network drive to my movie server (Server 2003) is mapped as drive M:
The PC automatically connects to M at logon.
I start Windows Media Center and use "MyMovies" to browse my collection.
All cover art is stored in the movie's folder on M: drive and shows up just fine.
However, when I click play to start a movie I get the Media Center error saying M:\\Movie Folder cannot be found.
However, if before I load up Media Center I double click "M:\\" drive and open that window in Windows Explorer, then go into Media Center everything works fine.
CN: WMC cannot find movie folder on mapped networked drive unless the network drive is opened in Windows Explorer prior to WMC being launched.