Unable to play offline

Unable to play offline as I did before I updated to Minecraft version 1.6.1.

What I expected to happen was...:
to be able to click on Play when offline and be able to play offline.

What actually happened was...:
I clicked Play when offline, and it said I had to sign in.

Steps to Reproduce:
1. Run Minecraft loader and click Play when offline.
2. ...
3. ...