When scala facet is enabled the keyboard will freeze every now and then. No exceptions thrown or anything, it just freezes. No keypresses are received in the scala project. Other open idea projects receive key presses just fine, as well as other open programs in the os. The freeze happens in current build more often than it happened in previous build. Now it happens maybe few times in ten minutes, previously it happened few times in an hour. To recover from keyboeard freeze, the project needs to be closed and reopened.