It was reported to me today that at least one juror (Firefox, Windows) was having a very hard time to save his comments in the ranking round. He would write the comment, save, move to the next picture, return, and then the comment would no longer be there. Sometimes it would save though, but mostly it wouldn't. He has repeated the same comment several times in some instances before it would save.
This would explain why several jurors did not submit comments. I was unable to reproduce the error, as it seems the montage-dev instance is no longer active.