Highlight problem source files

I'm evaluating IDEA 15 with the Scala plugin for my small team.  I notice that with Java project, any compilation errors populate the 'Problems' project view, plus I have the option to highlight source files using Settings > File Colours and using the Problems scope.  However, this does not seem to work in Scala, so I can't immediately identify source files with errors other than by trawling the Messages tool window.

Could you confirm whether I've missed a configuration setting, or if this is correct.  I think it's probably a deal breaker for me, which is a shame since IDEA seems pretty great in most other respects.

Thanks

J