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[Valerio Olevano <valerio.olevano@polytechnique.fr>]

Dear lvying,

I carefull read your log and out files.
there is something obscure as the the second dataset does not generate 
the KSS file
but the dataset 3 is able to read a KSS generated by the previous 
dataset.

But however, the next is general concerning the subject
"inversion and non-symmorphyc symmetries" in GW:

If the system possesses or not the spatial inversion symmetry is not 
important.
The Warning
 The inversion was not found in the symmetries list.
 - outstat - WARNING:
   GW prog. may give incorrect results !!
given so far has been removed in the new versions as we checked, we are 
sure the results
are good.

If the parity (spatial inversion symmetry) is present, it is eliminated 
when generating the KSS file
since the GW code treats at its place a time reversal symmetry (which 
is owned for sure by all the physical
systems). This to save time and also for another reason that will be 
clear in the following.

The GW code is not able to treat so far the non-symmorphyc symmetries, 
i.e. symmetries
associated to nonzero traslations (tnons).
So that you must pay attetention in the log file (as in yours) to 
errors of this type:
 - outstat - ERROR:
   Non-symmorphic operations still remain in the symmetries list
   Program does not stop but _KSS file will not be created...

When removing the inversion symmetry (and the set of symmetries which 
are the product
of a rotation times the inversion) the code has the chance to remove 
all the non-symmorphic
symmetries. So that we rest with only symmorphic symmetries.

If not, you should remove by hand the non-syymorphic symmetries.
set in the input file
nsym number_of_the_syymorphic_symmetries
sym   list_of_syymorphic_symmetries

In your ZnO case
nsym 6
sym
1  0  0   0  1  0   0  0  1
-1  0  0   1  1  0   0  0  1
0  1  0  -1 -1  0   0  0  1
0 -1  0  -1  0  0   0  0  1
-1 -1  0   1  0  0   0  0  1
1  1  0   0 -1  0   0  0  1
(check it again, please)
and good luck!

V.