The Chrome 'sticky keys' bug workaround ended up causing some issues with keyboard input in exported games in iframes (e.g. Scirra Arcade, Kongregate and Facebook). So I'm afraid there's one more release to fix that. Apologies if the release emails have been filling up your inbox. Hopefully it's the last of r79! Next build we'll be splitting to stable and testing branches so this shouldn't happen again.
Don't forget to check the r79 changelog if you missed it.