Steve,
True. If you look for the LW ID in your the LW app, you won't see it anywhere. Mr. McKernon doesn't want you messing around with that, so it's never visible, unlike External ID. It's there though. You can see it in your Object Info pallette in VW.
As far as duplicate instruments are concerned, that often happens if you import instrument data instead of merging data. The same thing would happen if you imported instead of merging two versions of a LW show file. It seems like you've found a decent workaround, but I'd check out merging. It'll save you time.
Until I had the problems I mention, I always used the Automated Actions that came with Spotlight. Granted, they haven't been updated for Spotlight 10 and LW 4. The Import, Export, and Merge actions always worked fine.
I often go back and forth between LW and VW during the course of a show as I keep the plot updated, adding units in both directions. Of course, since my latest 900+ unit show just scrambled it's data, I've really got to find out what's going on.
Jtallen from this list just sent me some mapping files which he's made up for LW4, so I'll try them soon and let you guys know what happens.
Wish me luck.....
seaghan42