Your problem is, as I described before, that you are referring in Q3 to {Q2_other}. There is no "other" in Q2. So Limesurvey can't find it, of course.
It is actually SQ007. So you would need to refer to it as {Q2_SQ007}. However, for piping in the text, you most probably need to use {Q1_other} for all of them, because you can't pipe an already piped text into another question, if you know what I mean?
You also can't use this relevance equation in Q3, because as I said, there is no "other" option in Q2:
Code:
!is_empty(Q2_other.NAOK)
Also you need to address it completely different, as this is now a normal subquestion item of a multiple answer question.
You'll need something like: