I'm trying to debug my survey logic, as a question is being displayed when it shouldn't.

Why do the question value names display in blue in the Relevance Equation section of the Question Summary?

I searched everywhere in the manual and can't find any explanation of the colours! I'm wondering if it is trying to give me a clue about why my code isn't working...

www.limesurvey.org/manual/Expression_Man...#Syntax_Highlighting

cyan text : Variable set on the same page,

Any variable that is set on the same page to the current question is shown in cyan text, showning it can be updated in javascript. The tooltip shows its name (if you used INSERTANS:xxx) or SGQA code (if you used the new naming system), the actual question, and its current value (or blank if not set). If the question type expects responses from an enumerated value set, the mapping of the codes to display values is show.

Aha, that's just the table I was looking for, thank you!