Translation is not imported

I want to reply and say I have this bug to and might be opening a support ticket.

I work for a very large international localization company that specializes in eLearning. My office alone does many RISE courses each month.

Once and awhile, we get a file that says import was successful but it remains in English.

for example, I have a course in to 5 languages. 4 worked (imported) into their target courses fine fine, 1 did not. All were duplicated from the same master EN file at the same time. Labeled for their target languages, and then XLF created from each copy andthen translated (with CAT [computer aided translation] tools, not by hand).

The only fix I've found that works is to re-duplicated EN, make a new extract, re-clean (what we call moving translations from a Translation Memory into a target file) and import.

That has worked so far, but now I have one that no matter how many times we duplicate and re-prepare files, it never imports.