Hi Antonie Pluk 

We work with IDML files in Studio frequently and haven't run into problems with any parts of the target file being left with source text. Normally the bigger worry is not having the content included in sdlxliff initially because of how the INDD is set up. If it made it into the XLIFF it's weird it didn't make it back out.

Is it significant chunks of text? Is there any pattern of behavior (i.e; the missing parts are always on master page content/pasteboard/tables etc.) that might provide some clues.

If it's only small parts, then in terms of speed, it may be quicker just to simply paste the target out of Studio manually into the correct place in InDesign. However, I appreciate that this may not be practical if lots of text is wrong or if the formatting is particularly fiddly, and doesn't explain the problem.

I don't suppose you'd be willing to provide your xliff file?

Thanks
Darren