Yes,
I think there's something messy here in the registry:
HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input
The key names should be things like "APE" and "OGG". I'm guessing you have some like "Monkey's Audio ...", but I don't know why.
Thanks, I already went through the registry and found those ghost entries in ...Plugins\Input
Here's what I had there:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input]
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\AA]
"Path"="C:\\Soft\\MC12\\Plugins\\in_aa.dll"
"Plugin Description"="Audible Plugin"
"File Description"=" Audible Audio File (*.aa)"
"Name"="AA Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\APE]
"Path"="C:\\Soft\\MC12\\Plugins\\in_ape.dll"
"Plugin Description"="APE Plugin (v3.99)"
"File Description"=" Monkey's Audio File (*.APE)"
"Name"="APE Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\APL]
"Path"="C:\\Soft\\MC12\\Plugins\\in_ape.dll"
"Plugin Description"="APE Plugin (v3.99)"
"File Description"=" Monkey's Audio File (*.APL)"
"Name"="APE Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\Audible Audio File (*.aa)]
"Path"="C:\\Soft\\MC12\\Plugins\\in_aa.dll"
"Plugin Description"="Audible Plugin"
"File Description"=""
"Name"="AA Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\CDA]
"Path"="C:\\Soft\\MC12\\Plugins\\in_cda.dll"
"Plugin Description"="Media Jukebox CD Audio Plugin"
"File Description"=" CDA File (*.CDA)"
"Name"="CDA Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\CDA File (*.CDA)]
"Path"="C:\\Soft\\MC12\\Plugins\\in_cda.dll"
"Plugin Description"="Media Jukebox CD Audio Plugin"
"File Description"=""
"Name"="CDA Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\FLAC]
"Path"="C:\\Soft\\MC12\\Plugins\\in_flac.dll"
"Plugin Description"="FLAC Plugin"
"File Description"="Free Lossless Audio Codec (*.flac)"
"Name"="FLAC Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\Free Lossless Audio Codec (*.flac)]
"Path"="C:\\Soft\\MC12\\Plugins\\in_flac.dll"
"Plugin Description"="FLAC Plugin"
"File Description"=""
"Name"="FLAC Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\MAC]
"Path"="C:\\Soft\\MC12\\Plugins\\in_ape.dll"
"Plugin Description"="APE Plugin (v3.99)"
"File Description"=" Monkey's Audio File (*.MAC)"
"Name"="APE Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\Monkey's Audio File (*.APE)]
"Path"="C:\\Soft\\MC12\\Plugins\\in_ape.dll"
"Plugin Description"="APE Plugin (v3.99)"
"File Description"=""
"Name"="APE Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\Monkey's Audio File (*.APL)]
"Path"="C:\\Soft\\MC12\\Plugins\\in_ape.dll"
"Plugin Description"="APE Plugin (v3.99)"
"File Description"=""
"Name"="APE Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\Monkey's Audio File (*.MAC)]
"Path"="C:\\Soft\\MC12\\Plugins\\in_ape.dll"
"Plugin Description"="APE Plugin (v3.99)"
"File Description"=""
"Name"="APE Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\MP+]
"Path"="C:\\Soft\\MC12\\Plugins\\in_mpc.dll"
"Plugin Description"="MPC Plugin"
"File Description"="MPEGplus file"
"Name"="MPC Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\MP3]
"Path"="C:\\Soft\\MC12\\Plugins\\in_mp3.dll"
"Plugin Description"="Media Jukebox MPEG Plugin"
"File Description"=" MP3 Audio File (*.MP3)"
"Name"="MP3 Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\MP3 Audio File (*.MP3)]
"Path"="C:\\Soft\\MC12\\Plugins\\in_mp3.dll"
"Plugin Description"="Media Jukebox MPEG Plugin"
"File Description"=""
"Name"="MP3 Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\MPC]
"Path"="C:\\Soft\\MC12\\Plugins\\in_mpc.dll"
"Plugin Description"="MPC Plugin"
"File Description"="Musepack file"
"Name"="MPC Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\MPEG Audio File (*.MPGA)]
"Path"="C:\\Soft\\MC12\\Plugins\\in_mp3.dll"
"Plugin Description"="Media Jukebox MPEG Plugin"
"File Description"=""
"Name"="MP3 Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\MPEGplus file]
"Path"="C:\\Soft\\MC12\\Plugins\\in_mpc.dll"
"Plugin Description"="MPC Plugin"
"File Description"=""
"Name"="MPC Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\MPGA]
"Path"="C:\\Soft\\MC12\\Plugins\\in_mp3.dll"
"Plugin Description"="Media Jukebox MPEG Plugin"
"File Description"=" MPEG Audio File (*.MPGA)"
"Name"="MP3 Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\MPP]
"Path"="C:\\Soft\\MC12\\Plugins\\in_mpc.dll"
"Plugin Description"="MPC Plugin"
"File Description"="MPEGplus file"
"Name"="MPC Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\Musepack file]
"Path"="C:\\Soft\\MC12\\Plugins\\in_mpc.dll"
"Plugin Description"="MPC Plugin"
"File Description"=""
"Name"="MPC Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\OGG]
"Path"="C:\\Soft\\MC12\\Plugins\\in_ogg.dll"
"Plugin Description"="Media Jukebox OGG Plugin"
"File Description"=" Ogg Vorbis File (*.OGG)"
"Name"="Vorbis Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\Ogg Vorbis File (*.OGG)]
"Path"="C:\\Soft\\MC12\\Plugins\\in_ogg.dll"
"Plugin Description"="Media Jukebox OGG Plugin"
"File Description"=""
"Name"="Vorbis Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\WAV]
"Path"="C:\\Soft\\MC12\\Plugins\\in_wav.dll"
"Plugin Description"="Media Center WAV Plugin"
"File Description"=" Waveform Audio File (*.WAV)"
"Name"="WAV Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\Waveform Audio File (*.WAV)]
"Path"="C:\\Soft\\MC12\\Plugins\\in_wav.dll"
"Plugin Description"="Media Center WAV Plugin"
"File Description"=""
"Name"="WAV Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\WMA]
"Path"="C:\\Soft\\MC12\\Plugins\\in_wma.dll"
"Plugin Description"="JRiver WMA Plugin"
"File Description"=" WMA Audio File (*.WMA)"
"Name"="WMA Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\WMA Audio File (*.WMA)]
"Path"="C:\\Soft\\MC12\\Plugins\\in_wma.dll"
"Plugin Description"="JRiver WMA Plugin"
"File Description"=""
"Name"="WMA Plugin"
"IVersion"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Input\WV]
"Path"="C:\\Soft\\MC12\\Plugins\\in_wavpack.dll"
"Plugin Description"="Wavpack Plugin"
"File Description"="WavPack (*.wv)"
"Name"="WavPack Plugin"
"IVersion"=dword:00000002
I deleted the complete "Input" branch and also all listed input plugins from
HKEY_LOCAL_MACHINE\SOFTWARE\JRiver\Media Center 12\Plugins\Uninstall
After that I reinstalled MC12 and now the problem seems to be cured.
I wonder where the excess entries came from. Could some development build have added them? Though, I cleaned the JRiver part of the registry completely in last October or November because of some other problems. The registry entries could not have been very old.