Channel switching very slow or timed out when PowerScheduler is enabled

[Paradroid]

TV-Server Version: MediaPortal SVN-Snapshot:-05-09-2008 19-58h - Revision:19069
MediaPortal Version: MediaPortal SVN-Snapshot:-05-09-2008 19-58h - Revision:19069
MediaPortal Skin: BlueTwo Wide
Windows Version: XP MediaCenter Edition V 2002 SP 2
CPU Type: Athlon XP 3400
HDD: WD 750GB
Memory: 2,5GB
Motherboard: MSI Platinum
Video Card: NVidia Geforce 6800
Sound Card: ESI JULI@
1. TV Card: TT-Budget S2-3200
1. TV Card Type: DVB-S / S2
1. TV Card Driver: 5.0.0.12
MPEG2 Video Codec: mpv (also tried nvidia)
MPEG2 Audio Codec: mpa (also tried nvidia)
h.264 Video Codec: coreavc
Satelite/CableTV Provider: Astra
HTPC Case: OrigenAE X16
Cooling: Much
Power Supply: BeQuiet Darkpower 550
Remote: Logitech Harmony 525
TV: Samsung Plasma 42"
TV - HTPC Connection: Gigabit Ethernet

Enabling TV takes too long and channel switching is timed out (No Audio/Video found), as long as the PowerScheduler Plugin is enabled within the TVServer. Doesn't matter if Single- or Multi-Seat. If watching the Server state via the "TV Server Configuration", looks like the channel has been switched, but the client will not notice. If the PowerScheduler plugin is disabled, Channel switching works very fast.

I also tried an old version of the plugin (just copied from a 2month old version), with same result.