Error message

I've seen these errors for the Mac client, but I'm on a Windows 8.1 build. I've been getting the error message about an 'error processing a message from the server' whenever I start a lobby or create a custom game. It's very repeatable. I've seen it for a few days, and I got fully booted and bugsplatted out of an All for One game. I'm not sure if they're related, but I've never bugsplatted League before. Might be a local problem, but I'm not sure. Any info would be helpful. Thanks!