At the time of this writing, it seems that the play2 support in IntelliJ 13 Ultimate has some minor issues ...
How I solved the problems:
1) Go to the project director and start the playback console (play.bat / play.sh should be on PATH)
2) enter the "compile" command in your game console.
3) enter the βideaβ command in your game console.
4a), if your IntelliJ project was open, IntelliJ will detect the changes and offer to restart the project. Confirm you want to reboot
4b) if IntelliJ is not running, open the File | Open ... and select the project directory.
These steps should solve your problem.
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