RISE Bug in explorer chapter display

Good morning everyone,

I need help on a elearning created under rise, with integrated storyline scenarios. Everything works on edge and other but at the end of chapter 6 impossible to go to 7 with Internet explorer (and lot of learners could use it). (only chapters 6 and 7  had storyline activities) I finally made videos of storyline activities to simplify the project, thinking that Activex could interfere but it bugs and always at the same chapter passage. I even deconditioned the button "continue" nothing work. Internet explorer does not display chapter 7. It display when the navigation is free (but not the video) and if I don't read the chapter 6 before by using the left menu. 

Could you help me ? 

Thanks for your help

Best regards 

Eva