XMLTV stopped working when invoked by mediaportal

[ophois]

MediaPortal Version: 0.2.2.0 stable
MediaPortal Skin: Replicant
Windows Version: XP Media Centre
CPU Type: AMD 64 3000+
HDD: C:120GB IDE, E:300GB SATA, F:300GB SATA, S:300GB IDE RAID Mirrored pair
Memory: 1024GB
Motherboard:
Motherboard Chipset: NForce
Motherboard Bios:
Video Card: Radeon X550
Video Card Driver:
Sound Card: Onboard
Sound Card AC3:
Sound Card Driver:
1. TV Card: WinTV PVR 150
1. TV Card Type:
1. TV Card Driver:
MPEG2 Video Codec:
MPEG2 Audio Codec:
Satelite/CableTV Provider: Telewest, UK
HTPC Case:
Cooling:
Power Supply:
Remote:
TV: LG 42" Plasma
TV - HTPC Connection: TV acts as standard monitor

I've started having a problem with XMLTV. Before christmas everything was working fine, now if I hit the "Run Grabber" button in configuration.exe the resulting file contains only the list of channels and no program information.

If I run xmltv.exe by hand with the command:

xmltv tv_grab_uk_rt --config-file tv_grab_uk_rt.conf --output TvGuide.xml

I get a valid fully populated file containing all channel and program information.

I can then load this manually generated xml file in to the system via the "Import from TV Guide" button and this works.

Unfortuantlly this means I have to manually go through the above process every few days to keep my guide up to date.

Can anyone give me any ideas as to why mediaportal is not able to run xmltv.exe itself correctly?

I've attached a zip file containing the output from xmltv when mediaportal runs it and when I run it and the configuration file I'm using. Any help would be appreciated as I've no idea whats gone wrong here.

There are a few warnings to stndard out when xmltv is running but Iwas seeing these before and its the same no matter who is running xmltv.exe: