I pressed the "Accept" button and got into champion select but I couldn't see anything but this screen:
I could hear champion voice lines when they got banned but I didn't see any of champ select and couldn't pick any champion because all I saw was that screen. And eventually it kicked me out because I didn't pick a champion. After I got kicked, the Accept/decline screen was still there but I could see the lobby.
Now I have to wait 5 minutes and I lost some LP because YOU screwed up and can't make a stable client. It's really ironic how many people have to deal with leave busters and everything just because you can't make a stable game and client.