As I mentioned in one of the posts: If you use just numbers for the question code it will be considered a number and you don't need the ", but if you have a string, you need the ".
Help us to help you!
Provide your LS version and where it is installed (own server, uni/employer, SaaS hosting, etc.).
Always provide a LSS file (not LSQ or LSG).
Note: I answer at this forum in my spare time, I'm not a LimeSurvey GmbH employee.
