Slidelist disapearing in HTML5 safari on Ipad

Hi, 

I have a 50 slides long presentation. 
I have to show it in the safari browser on Ipad.

When I select one of the last 10 slides, the entries in the slide list disapears completely, leaving an empty list.
When I'm in the second half of the presentation, I can't no longer swippe the slidelist to the top of the list, it stay blocked at slide 20 max.  

It's an emergency, I have to make it work for tomorow morning. 

Did anyone encountered this issue already ?

How can I fix this ? 

Need help !

(Thanks for not telling me to use the Articulate Player App : Safari on Ipad is mandatory...) 

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