Cobertura does not show the colored source code if a build is marked as unstable.
It would be nice if the source code coloring would be independent of the state
of the build. (Our usecase: we have only unstable builds due to findbugs
warnings. No stable build has been created yet. Here cobertura does not source
highlighting. After disabling the unstable setting in the findbugs plugin, and
producing a stable build, cobertura suddenly shows the source highlighting!).

Moreover, the project action points to the last successful build (which might be
quite old). Maybe it would be better to point to the last build with valid
cobertura results.