Sign-in screen not working

[Mona5E90]

I can't sign in to my free mobile Acrobat Reader account. Whenever I try, the sign-in screen blinks once, but nothing happens. I want to backup documents to Document Cloud from Acrobat Reader. I can sign in to Document Cloud elsewhere, but can't access the Acrobat Reader that way. Any help, please?

[katunlowan@gmail.com]

1. Ok