To reproduce: 1. add a project group 2. add a project 3. force a build 4. observe numbered directories in both working-directory and build-output-directory 5. delete the project group Expected results: The project group, working copies and build output are all deleted Actual results: The project group and working copies are deleted, but the numbered build output directories are left in place Continuum should delete the build output directories when a project is deleted. (I did not test deleting a single project, just a project group containing three projects.)