At the Cruise Control .NET Continuous Integration Server Dashboard click on any one project to get a "Project Report."

Click on a line item beneath "Recent Builds" at the left navigation at "Project Report" to see details for the build. Then click on "View Build Log" at the left navigation to see the details for that particular build. If that particular build is breaking, you may just scroll to the bottom of the details to see where the break happens in the log. (The dashboard itself where you see a list of projects is where you may force a build with the "Force" button at a given line item.)