MP Config crash assigning channels w/o channel groups present

[RamonS]

TV-Server Version: n/a
MediaPortal Version: 0.2.3.0 RC3 & SVN 16429
MediaPortal Skin: Blue Two
Windows Version: Windows XP SP2 64 bit
CPU Type: AMD Athlon 64 XS 5200+
HDD: 320 GB Seagate SATA RAID
Memory: 2 GB Corsair 6400
Motherboard: Asus M2N32SLI-Deluxe
Motherboard Chipset: nVidia nForce 570
Motherboard Bios: latest
Video Card: eVGA GF 7600GT 256MB PCIe 16x
Video Card Driver: latest nVidia drivers
Sound Card: onboard SoundMax HiDef
Sound Card AC3:
Sound Card Driver: latest
1. TV Card: Hauppauge HVR-1800
1. TV Card Type: ATSC/NTSC/QAM/FM
1. TV Card Driver: latest Hauppauge driver (CD 3.4d1)
MPEG2 Video Codec: MPV Decoder
MPEG2 Audio Codec: MPA Decoder
Satelite/CableTV Provider: TimeWarner / ATSC OTA
Cooling: 4x80mm, 1x120mm fans
Power Supply: Rosewell 500W
Remote: Snapstream Firefly X10 - R1000

Steps taken:
1. Start Configuration
2. Go to TV > Channels
3. Deleted all channel groups
4. Assigned a channel to non-existent channel group
=> JIT message

JIT message text and confi log are attached.