We’re releasing the first bug fix release MPS 3.4.1 today. If you have migrated to MPS 3.4 already, there should be no surprises for you when you switch to 3.4.1. If you haven’t migrated to 3.4 yet, then now is a good time to do so.
You can download MPS 3.4.1 from the usual place.
The Drive to Develop
-JetBrains MPS Team