hi felix, 

there are warnings from tautrackslimmer in tier-0 processing with recent data.
if you process an esd file of run 179710 lb300 express stream (early morning of friday, 15 april) with atlasproduction 16.6.3.6 by
+verbatim+
reco_trf.py inputesdfile=/afs/cern.ch/user/g/gencomm/w0/oda/run179710/data11_7tev.00179710.express_express.recon.esd.x111._lb0300._sfo-5._0001.1 outputaodfile=aod.pool.root outputhistfile=hist.root 
-verbatim-
you will see the following warning message 13 times for 203 events. 
+verbatim+
tautrackslimmer                                   warning no or empty track container found in tds
-verbatim-
if this is serious, please investigate the real problem.
otherwise, please lower the message level to debug.

thanks in advance,
susumu 