doing more or less anything with dev gives:

+verbatim+
  file &quot;/afs/cern.ch/atlas/software/builds/nightlies/dev/atlasevent/rel_4/installarea/python/aodfix/aodfix.py&quot;, line 273, in aodfix_postcombinedrec
    from muonspshowerbuilderalgs.muonspshowerbuilderalgsconf import mergemuoncaloenergycontainers
importerror: cannot import name mergemuoncaloenergycontainers
-verbatim-

one simple example would be:

acmd.py merge-files -o copyesd.pool.root /home/emoyse/athena/recointperf/h4musf05/esd.pool.root

looking on disk it seems like mergemuoncaloenergycontainers is indeed missing:
+verbatim+
ls /afs/cern.ch/atlas/software/builds/nightlies/dev/atlasreconstruction/rel_4/installarea/python/muonspshowerbuilderalgs 
muonspshowerbuilderalgsconf.py  muonspshowerbuilderalgsconf.pyc  muonspshowerbuilderalgs_confdb.py  __init__.py  __init__.pyc
-verbatim-

can someone take a look?