I just tested the latest version of VoxCommando: 0.980 with MediaPortal and everything seems to work fine with the default English MediaPortal configuration that comes with VC.
VC 0.980 can be downloaded here:
http://voxcommando.com/downloads.aspHere are all the versions I used:
Windows 7 64bit
MediaPortal version 1.2.3
WifiRemote version 0.7.1
...and the latest versions I could find of Tv-Series plugin and Moving-Pictures plugins for MediaPortal (sorry I can't remember which versions and my test machine is off now but I don't think this is really important).
I installed VC to an empty folder and selected the standard MediaPortal configuration.
Please try this. If you have problems, please be specific, and I will try to help you, or if there is a bug I will try to fix it...