I successfully configured a few jobs to run crap4j- and cobertura-reports.
The reports are collected for every build and work fine.

However for some jobs the links to the graph-images appear to be broken.
The "Test Result Trend"-graph is still available though.
I don't know if this is a bug in the crap4j- and cobertura-plugins or if it is a
more general problem.

I'll attach screenshots to explain what I mean.