I had the exact same issue, but what ehgjr said about wildcards in a January 2012 comment gave me an idea.
The problem in the cluster-reuters.sh script is the 'clusters-*-final':
$MAHOUT clusterdump \
-dt sequencefile -b 100 -n 20 --evaluate -dm org.apache.mahout.common.distance.CosineDistanceMeasure -sp 0 \
For me, the clusters-*-final resolved to clusters-2-final. So I just re-ran that one clusterdump command outside of the cluster-reuters.sh script using 'clusters-2-final' instead and all ran fine. Obviously not a fix to cluster-reuters.sh, but a workaround to help you see the clusterdump results.
PS: I'm running this over a 20-node Hadoop cluster, not locally. It seems strange that the --input, --dictionary and --pointsDir parameters reference HDFS locations while the the --output parameter references your EdgeNode's file system.