Permit skip with 'safety net'

Dear Articulate staff and fellow Storyline users,

My client's candidates should be able to skip questions if they're in doubt. But in the end, they have to answer every question. They could check for themselves whether they did, but I'd rather build in an automatic safety net.

I've come up with this solution:

• Question navigation: Next / Previous
• After the last question the candidate presses a custom Submit button that triggers:
  • Set [variable] Submitted equal to True
  • Jump to Question 1
• Back at Question 1:
  • Submit interaction Multiple Choice
    When the timeline starts
    If Submitted is equal to True
  • Jump to next slide
    When the timeline starts
    If Submitted is equal to True
  • >> Storyline continious automatically untill the end of the test only to pause at unanswered questions.

• When reaching an unanswerd question:

• Prompt 'You must answer this question'

• Candidate answers and presses Next

This works in preview mode and Flash stand-alone, but jams in browsers, both the Flash and html5 output. I's really like it to work because is combines flexibility with safety. Any ideas on why it jams? Of does anyone have another idea that might work? Thank you!

Freek

I've attatched the Storyline 360 file and output zip.