[Client] Cannot connect to any games

I was playing fine yesterday. This morning I got the "Your data may be corrupted" error at the launcher, so I let it do its thing. It took a while, and then let me launch. I got into a lobby just fine, was talking to people just fine. However, when the picks and bans were finished, and the game was about to start, I noticed that the splash screen did not come up. After about 5 minutes, it finally came up. However, I was the only person loaded on my loading screen. And the loading screen kept going black randomly. Finally, after sitting at 100% for another 5 minutes, I got the error "You have disconnected. Please check your internet connection and try again.". I tried again, same result.