Hello,
when trying to top-up the account using a Polish Credit Agricole card I get stuck on a blank Verification screen. Tried logging-out and back to the app, re-installing it, removing and re-adding the card, trying Revolut on another Android phone (different make, different version) - all to no avail. And yes - I have credit on the credit card 
I guess it’s a problem with 3D Secure option introduced on 1.07.2018. Can anyone help me out?
I use CABP card without any problem. Please try to change your default web browser to any other (Chrome should be ok). Then just verify your card. After a few tops up you won’t be asked about 3DS.