I just downloaded the game and finished the tutorials and played my first match (I think this first match is the last part of the tutorial).
Then, a white message appeared taking most of screen space. I'm not sure if it's supposed to be an ad, or if I received a reward, or it's an information message. But it's totally white blank.
I clicked on the (X) button to hide it. It goes then appears again.
How can I get rid of it?