Champion Kat and Login Screen

I was playing a game of Lol 5v5 regular I was kat mid and my jungler was in there jungle by red so I went over with her and was hiding in the bushes and Zyra came over there jungler and we killed her and after that my Q ,R and B would not work I tried using my keys and clicking manually but it didn't work I tired Alt Tabbing but still didn't fix. After game ended me and my friends started a new one and I accidently closed my lol and when I tried to reopen it after I clicked launch it wouldn't bring up the login screen so after it restarted my comp fixed the problems.