I've upgraded to 12.0.3 and play 2.1RC4 (using play 2 plugin)
As previously mentioned - there is no support using the Play! / sbt compilation for running unit tests (critical bug logged 5 weeks ago - no action taken). SCL-5112
And the play compiler error messages are not getting parsed so just appear as one big lump in the messages window (just reported as SCL-5253 )
Can we have up-to-date scala / play support please?