@anon084052 anon758749, I think the problem relates to the change in ISO codes, that took place during the migration process from Paratext 7 to Paratext 8. NIV changed I think from en to eng-US, and that is what messed up your data. I believe if you used any English version, that has the language ISO of eng, your data would still work. So I don’t believe there is a need to stick to the old NIV version. Here is the ISO code for English:
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You can see that a code of eng in your Paratext English versions, is the same as en. What you MUST stay away from, are all the NIV versions, which are now either eng-US, or eng-GB.
Use any English version that has eng as its ISO for your Model Text when interlinearizing, and I think all should be OK.