From your logs it looks like the device is managing to lock on to some of the frequencies, but is not delivering any data. I dont really have suggestions for next steps for resolving this.
I'm wondering if it could have something to do with my drivers - having to use some beta drivers to get the device running under Vista - I'll try gbpvr under my XP laptop and see if there's an improvment
Good news - the XP laptop is scanning and finding transponders! Could it be that the drivers I have used under Vista contain different commands? I'm not an expert in dll's but if anyone would like to have a look at my drivers, I'd be happy to send...