No, as I understand it Guidehound is only useful with WMC - it translates XMLTV formatted data into the Microsoft proprietary format that WMC understands. MediaPortal understands XMLTV natively (well, technically it has a built-in plugin)...

This is strange. Try shutting down then starting up your computer (*not* a restart - a full power down), and then immediately try to use EPG Collector with either the Auckland infill frequency (530000 kHz) or the Waitarua frequency (538000 kHz). One of those should work...