Xcode 4.5.x Version Editor shows "No Editor" Message
I recently started a new project with nothing unusual about it. Whenever I go to use the Version Editor I get the message "No Editor" where the text normally would appear. Even stranger, this is the same for all my files except for the Project itself. It actually shows version history properly.
The only thing I've done differently with this project from any others is use Cocos2D and BitBucket (with GIT). Everything else is pretty vanilla.
You should select file and wait for long time. Sometimes I have same issue with project file. After 3-5 minutes the issue was fixed (editor was loaded) and I can edit the conflict.
The Version Editor has always been pretty buggy.
Try File -> Source Control -> Refresh Status and see if it fixes it.