Well that was short lived.
It worked for about an hour and DM no longer can see the blackberry over BT. Weird.
I have built a new Win XP pc and installed DM 4.6 on there and it works. Must have something to do with the Bluetooth stack on Windows 7.
No clue. I'm scratching my head on this one. I've tried other blackberry forums, google and bling. Not a lot out there.
I'll try again next time I get the itch. For now, I'll just have to keep the cable handy.