Storyline 360 Results slide stuck on loading screen

I'm having the same problem - MCQ slides are reporting each answer as 'correct' or 'incorrect' as they should, but everything then just freezes after submitting the final answer and the results slide just doesn't open.

I've spent 4 hours today looking at the various triggers, and they're all as they should be - so I'm not sure why this is happening (it never has before!)

File attached. ANY assistance woulds be great, as we are due to have over 1000 students using this package in a couple of weeks!

Thank you!