The main problems I’ve seen related to migrated interlinear data is a
mismatch between the language code used for migrated the interlinear text
and the language code of the model project that is being used in Paratext 8.
You can see the migrated interlinear data by looking in the project folder
of the text being interlinearized. There will be folders with the names
like Interlinear_en (or whatever language code the model text was using).
If these migrated language code and the model text language code don’t
match, it will look like none of the interlinear data is there, but it
actually is if we can get the codes to match.
We switched from using language names to language codes to because the
codes are a standard, but the names aren’t and changes to the language name
of a model project caused this a similar problem with missing interlinear
data in Paratext 7.
If you have trouble spotting what the issue is, send me a note directly and
we can arrange a support session.