Another round of bug-fixes has been wrapped up and made available for you – the MPS 3.0.3 release is now ready for you to download. Additionally and importantly, the IntelliJ IDEA MPS plugin now supports both IDEA 12 and IDEA 13, so you are no longer restricted to the old IDEA version.
For details on the fixes you may check out the release notes.
Develop with pleasure!
-JetBrains MPS Team