No, I've seen this problem before also. I can't remember what I did to cause it, so I only reported it once, but never heard anything until this.
I can confirm that MC can show duplicate files in MC, but both show the exact same filename, including the path, and deleting one of the files will, in fact delete the only copy from the database.
The only way I was able to delete the 'dups' was to delete one of them, but not tell it to delete permanently, just delete from MC (can't remember the exact wording).
Media Center Registered 12.0.279 -- C:\Program Files\J River\Media Center 12\
Microsoft Windows XP Workstation 5.1 Service Pack 2 (Build 2600)
Intel Pentium M 597 MHz MMX / Memory: Total - 1047 MB, Free - 230 MB
Internet Explorer: 6.0.2900.2180 / ComCtl32.dll: 5.82.2900 / Shlwapi.dll: 6.0.2900 / Shell32.dll: 6.0.2900 / wnaspi32.dll: N/A
Ripping / Drive D: HL-DT-STRW/DVD GCC-4243N Mode:ModeSecure Type:Auto Speed:Max
Digital playback: Yes / Use YADB: Yes / Get cover art: Yes / Calc replay gain: Yes / Copy volume: 32767
Eject after ripping: Yes / Play sound after ripping: No
Burning / Drive D: HL-DT-ST RW/DVD GCC-4243N Addr: 1:0:0 Speed:24 MaxSpeed:24 BurnProof:Yes
Test mode: No / Eject after writing: Yes / Direct decoding: Yes / Write CD-Text: Yes
Use playback settings: No /
Portable Device Info
Removed devices: Chris
Device info dump for 'Chris Laptop':
WMDMName:
DeviceUID: {ED1C1A3A-128A-41E0-83D7-364EDD5E881A}
CanonicalName:
VendorName: ; VendorID:
ProductID: ; FirmwareVersion:
WMDMSerialNumber: NULL
DeviceType: 4; DeviceID: ; DeviceName: ; UnsupportedDevice: 0
IsDrive: 1; DriveLetter: ; DrivePath: C:\Documents and Settings\Christopher Baber\My Documents\My Music; MainDriveLetter:
IsJanusCapable: ; IsIpod:
SupportsAlbumArt: ; AlbumArtEnabled: 1
SupportsFolders: -1; PlaylistFormat: 0; EjectMode: ; AlwaysPumpCOMMessages: 0
SupportedFileTypes: *
ContextMenus:
MemoryTypes:
InstallURL:
ApplicationName: Media Center
ImageName:
RootBasePath:
AudioBasePath: \
ImageBasePath: Images\
VideoBasePath: Video\
DataBasePath: Data\
PlaylistBasePath: Playlists\
DatabaseBasePath:
AudibleBasePath: Audible\
MatchKeyExpression: If(IsEqual([Media Type], Image), [Name][File Size, 0], [Name]Clean([Artist], 1)[Album][Genre]FormatNumber([Track #, 0])[Media Type])
ChangeKeyExpression: [Rating]
Interface Plugins:
Library Server (Active)
TiVo Server
UPnP Server (Active)
Playing Now (Active)