SoapUI Pro 4.0.0 Coverage GUI brakes when cancelling close

Another small usability bug.

I go to the MockService Coverage tab, I run the suite, get some coverage, then I pressed the X to close the MockService window then pressed no when asked if I wanted to stop the MockService running, but the coverage tab goes grey and clicking enable coverage does not do anything. Work-around being to restart the MockService.

Thanks.