Yep, VB-Cable. The audio is coming into Cakewalk OK, it's just that I combine the channels and output them the way I want.
Yes, track view is enabled - there are a few tabs over the track window (assuming that's the one which has the tracks laid out above each other, not side by side) and one of the them is labelled "Tracks". When I click on that tab, I get a pull-down menu and the third command down is "Bounce Track(s)..." but it is greyed out.
The Wipe, Copy and Show All commands are also greyed out, if that helps.
Confused...