Is it the EFB?
I don't know if the EFB known to be the problem this time, as it was in April, but the notion does raise a question. How or why should an airline, or aircraft operations be so affected by un-certified off-the-shelf equipment? Were any aircraft so affected while airborne? I hope not. And if it is because the Jepps could no longer be used (admittedly I don't this for sure) then why weren't the normal paper versions available on board?
Are the EFB's also an essential part of computing the TOLD numbers?