Gameplay chat invizible

So, i download LoL . All good . In the evening, i started to play . Enter in a ranked game, and when I wanted to write to my teammates if we were invading, I noticed that I couldn't see my chat. I looked in the settings and everything was ok. After that game I went out. The next day I said to go back to a game, as well, invisible chat. When I'm in the game and I press enter to write something on the chat and press enter again, the sound of the chat is heard, but nothing is seen, it is simply invisible. I went into TFT and it was peaking there, it was no longer invisible. Only in the classified and training game can not see my chat.