I updated to the latest version of MASON from the CVS repository and get the following error: sim/util/SimpleProperties.java:144: cannot find symbol symbol : class Propertied location: package sim.util else if (o!=null && o instanceof sim.util.Propertied) ^ sim/util/SimpleProperties.java:145: cannot find symbol symbol : class Propertied location: package sim.util auxillary = ((sim.util.Propertied)(o)).properties(); ^ 2 errors make: *** [all] Error 1 There does not exist a "sim.util.Propertied.java" so I'm guessing maybe someone forgot to commit that? Cheers, Mark