Put the summary of the bug you're having here
What I expected to happen was...:
Have a Play offline button
What actually happened was...:
Clicked Play, says I need to login. No option for offline play as before, with 1.5.2 version, available.
Steps to Reproduce:
1. Run the Minecraft Loader (1.0.9).
2. ...
3. ...
You can play offline when you do not have an available internet connection. When you have working internet it obviously won't let you play offline.