Jeffery, We have not been talking about using the FlexText method of importing Scripture into Fieldworks. As was described above the work is done by two operations: 1) In Paratext under Project properties click on the association tab and select the Flex database you want to use, 2) in FLEx go to the Texts & Words area click on the Choose text icon and check off the Bible books you want to import. Flex will do the rest. If you have a back translation project associated with you vernacular project in the way you have shown in your screen shot, Flex will detect that and import the Back translation into the Free translation line for you.
You cannot currently import interlinearized data in to FLEx even though “FlexText” gives that impression. (The data models between Paratext and FLEx are too different currently) I did not think it worked at all for Scripture, but I did try it just now and the results were not as good as using the method in the paragraph above.
If you still have trouble, let me know and I will send you more detailed information.