Okay, that’s reassuring in some ways.
We had a pretty severe bug in December last year regarding Android and CSV export (see here: Important Information Regarding a Recent Software Bug in Interviewer). I am wondering if the fixes we implemented there might have indirectly caused this bug.
I have attached the version of Interviewer prior to that bug being fixed. I would be interested to know if you are able to trigger the issue using this version. Please remember that this version has a known serious bug in the exporter code, which is triggered by using the merge sessions option and repeatedly exporting the same data. Please only use this version of the app as a diagnostic tool to help us find the cause.