Hey Kerry - didn't you post something a long time ago about another program you tried too - maybe it was Alibre? Did that also work for converting various file formats?
From my experience, I've found Vectorworks to be fantastic because I can batch convert - so I could take a whole folder and convert 1000 files in there to separate files in a new folder, all in the background while doing something else. It's not cheap, though - the new version runs about $1,500.00
jnr
Josh Rayburn
Hall's Edge, Inc.
CNC Machining Service