Plugins installed by Hand do not appear in list "installed extensions" (1 Viewer)

[HungrigerHugo]

MediaPortal Version: 1.1.1
MediaPortal Skin: PurevisionHD 4.4 blue
Windows Version: Windows 7 x64 Professional
CPU Type: Intel Core i5-750
HDD: 6x Samsung HD154UI
Memory: 2x GeIL Value DIMM Kit 4GB PC3-10667U CL7-7-7-24 (DDR3-1333)
Motherboard: ASUS P7P55D Pro
Video Card: ATI Radeon HD 5750
Video Card Driver: Catalyst 10.9
Sound Card:
Sound Card AC3:
Sound Card Driver:
1. TV Card: ASUS My Cinema EHD2-100
1. TV Card Type: 2x analog/DVB-T
1. TV Card Driver:
2. TV Card: TerraTec Cinergy C HD
2. TV Card Type: DVB-C
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec: Cyberlink Video Decoder (PDVD9)
MPEG2 Audio Codec: ffdshow Audio Decoder
h.264 Video Codec: Cyberlink Video Decoder (PDVD9)
Satelite/CableTV Provider:
HTPC Case: Chieftec HiFi HM-01
Cooling:
Power Supply: CoolerMaster Silent Pro M500
Remote: iMON iPad
TV:
TV - HTPC Connection: HDMI


I noticed the "MediaPortal Extension Installer" does not work propper:

Extensions which are installed manual by me are not listed in the listview "installed extensions" ( i installed them by doubleclick on the .mpe1 file).
The second try was to install them inside the MediaPortal Extension Installer (> Options > "Install local extension"). But they did not appear in the list after that

Extensions installed via "known extensions" (webinstall) are listed inside "installed extensions".

Maybe this is a bug?!



I am using MP 1.1.1
extension i tested: tvwishlist, backupsettings, Skin Purevision HD Blue, Intelligent Frame Correction, Fanart Handler