Play Solo/Start Server/Start Player freezing on Mac when closed

I’m on 10.9.2 now, and when I go to Test > Play Solo, it works fine. But, when I go to close it, it freezes up completely, and I have to force quit studio. Not sure if 10.9.2 is causing it or if it was a Studio update, but there’s nothing suspicious in the console. I don’t really know what’s going on. It only happens with Test > Play Solo.

Any ideas on what’s causing it?

Edit: Also happens in Test > Start Server and Test > Start Player

It might be a problem with Qt. All Qt apps on Mac broke after upgrading to Mavericks. I have talked to a dev and they are working on releasing a patch for this soon.