When the launcher loads after being opened, it will check for internet connection - if you have, it will give you the 'Play' button; if you haven't, it will give the 'Play Offline' one. But after that, it doesn't check anymore, so if you get connection after opening the launcher, it will not give the 'Play' button. In previous versions, after sucessfully getting connection, it would give you the option to play in online mode, but now it doesn't, requiring to be closed and opened again to give you the option.
Steps to Reproduce:
1- Disconnect from any internet connection you have currently.
2- Open the launcher - it will show the 'Play Offline' button.
3- Connect again. After getting connection, it will still show the button.