Is there a way to disable the automatic browser language detection?

Are you using Mailing list? You can specify the language there. I have tested 21 languages like this-no problem occurred

I'm not using Mailing list, I'm distributing anonymous surveys with the q_language alteration.

@hmiller are the recipients same or different? Could it be something to do with cookies?

@hmiller I ask because for me when i test it keeps opening the first language i opened it on (not the browser language), even after i submit the feedback

@mslreen interesting! the recipients will each take it once, so they're all different. I'll investigate whether it's a cookies issue. Thanks! For what it's worth, I've also spoken with a Qualtrics support agent and there is no way to turn off or override the auto-language detection feature.

One thing you need to beware of is the difference between Spanish (ES-ES) and Spanish Latin America (ES). If you translated your survey using Spanish (NOT Latin America) then your query string would need to look like "&Q_Language=ES-ES" otherwise it will default to whatever language is set in your survey options (which is English by default). I had this problem on some of my surveys. If I had to bet money, I would say your survey is translated using Spanish (ES-ES). If you need to go from ES-ES translation to ES, simply download the ES-ES version and edit the text so the PhraseID is set to ES, then upload the translation back to the survey under the Spanish (Latin America) translation.