Translations:Activating a survey/111/en
From LimeSurvey Manual
Attention : If the survey is active and you open several tabs by clicking Execute survey, you may not be able to fill out the survey (an error will be displayed suggesting that you use the index to navigate the survey) in tabs previously opened to the last one. When that happens, please close all the tabs and make sure to open only one tab at a time to test the live version of your survey.