DiSEqC 1.0 does not work properly . The tuner scans the first LNB (Level1AA) only and ignores the other satellite positions.
Navigate to the installation directory of the TV-Server. The default directory is:
C:\Program Files (x86)\Team MediaPortal\MediaPortal TV ServeServer
Find the file KNCBDACTRL.dll in this directory.
Rename the file to KNCBDACTRL_off.dll or KNCBDACTRL_backup.dll or whatever you prefer. As an alternative, you can move the KNCBDACTRL.dll file out of the TV-Server directory to a backup directory of your choice.
Restart your PC! (Restarting the TV-Server (TvService.exe) is not enough.)
Done! DiSEqC 1.0 should work correctly now.