Minecraft 1.7.0 doesn't connect to Code Connection 1.50

On Minecraft 1.6.1, I could connect to Code Connection.

However, after updating 1.7.0, I can't connect.

1. Launch Code Connection
2. It shows IP Address, copy it to clipboard
3. Launch Minecraft
4. Open chat window and paste the IP Address with connect command
5. The screen of Code Connection is turned to be white a moment, but it return to the IP address screen.

I retrieved the version 1.6.1 of Minecraft from backup and It works. I guess the cause is the version 1.7.0.