Boutton dosn'et work in 2nd version

Hi have created a course with 3 buttons in a page to access 3 differents scenes. After the tree are visited, a hidden image of "checkmark" appears to normal and they trigger a layer that let access to a Quiz. Simple as that! and all works good!. My .story was started in a french version, then a made a copy to start the english version, but in my publish english version my 3th button doesn't trigger it out. I changed order in triggers of the button, recreate another button to test, and it don't trigger anything!, i get the same behavoir... in my publish version for web the page get really stuck only when i click the 3th button, and even my mouse disappear completly! Do you have any clues to solve this problem?