Thx for the quick reply.
Well my system specs aren't that bad
Windows XP SP3 x86 latest updates + .Net 3.5, silverlight and all the other bla
ATi Catalyst drivers 8.8
MediaPortal 1.0 RC2 + latest svn weekly build
This is a quite fresh install (no more then a week old)
CPU: E6750 @ 3,2GHz
RAM: 4GB OCZ @ 950MHz 5-5-5-18 T2
GFX: ATi HD3870 512MB
MoBo: Gigabyte P35-DS4 rev 1.0
PSU: Enermax 620w
Sound: Creative X-Fi xTreme Music
TV-card: Hauppauge PVR-150
Probably more than you need but at least I could be specific
Just discovered that this specific issue is also skin speciifc with MediaPortal, so there's probably not much you can do here. The Aeon Wide Mediaportal skin, which I'm using, is kind of a hack anyways...