I have a similar signal detection problem...
My setup is a FireDTV FloppyS2. I have an issue trying to pickup Turksat channels from the UK. Not an easy signal to find with a regular STB, but it works. Just to check theres no stupid cabling issues, I scanned Turksat with DVBViewer Pro. Picked up over 150 channels (all West and Europe beams - as normal for UK). Win MCE seems to give up detecting channels if the signal strength is around 64% or less.
Does anyone know if there is a registry hack (or software) available to either ignore any min strength requirement, or lower the requirement? Hardware and cables are ok - definately an MCE issue.
I am already routing sound through a kernel VAC, so not keen on DVBlink to route channels from DVBViewer into MCE. I could do with a proper, no overhead fix would be great - if there is one?
(Theres also an issue with out of date list of transponders MS includes with Windows 7. I think the user agreement for the setup list is 2008? Eurobird/Astra 2A are constantly changing transponders....)