Get a Danish girlfriend and always make sure she's on the right side of You.
OK, then just speculate on what could help you instead of just trying...
-level20peon
Well MediaPortal has to do everything by software, while your STB does it by built-in hardware.
It is no wonder that the results are different if MediaPortal lacks one piece of software. The STB is well developed before it is available on the market so it has everything it needs built-in. MediaPortal would depend on codecs, drivers etc. even if it wasn't BETA-software anymore. You get the point ?