Description of problem: Deleting a job should cancel any running recipes. Otherwise you get into a weird state where you can only cancel the job from the command line. Version-Release number of selected component (if applicable): 0.7.3
You can only delete jobs which are completed. Are you referring to the problem described here https://bugzilla.redhat.com/show_bug.cgi?id=715226 ?
*** This bug has been marked as a duplicate of bug 715226 ***