I don't use V19 wire but I have found in V16/17 wire that you can not have blocks in your drawing or it will not show them. Also, I always save a file as autocadR12 DXF file. I tried to save it as an autocad2000 DXF file and bobwire would not read it.
Those are the only problems I have had with V16/17, I don't know if it is of any help to you though.
Dave