Which program did you use to make changes to the csv file? When using Excel this might cause problems because Excel changes the internal data structure which may lead to problems.
Can you reproduce the problem when not editing the files? If so please
open a ticket at the bugtracker and give as much information as possible and also attach your survey. You can mark your ticket "private" so that only the developers will be able to take a look at it.
Afterwards please post the link to the bugtracker so we can follow the progress.