obabel doesn't split molecules I have a .xyz input file 

8
Energy =
C     0.0354972    0.7111560   -1.7500000
C    -0.0354972   -0.7111560   -1.7500000
C     1.1823040   -1.4277968   -1.7500000
C     2.3594716   -0.7301614   -1.7500000
C     0.0354972    0.7111560    1.7500000
C    -0.0354972   -0.7111560    1.7500000
C     1.1823040   -1.4277968    1.7500000
C     2.3594716   -0.7301614    1.7500000


(this is shortened, problem stays the same) which I would like to split with obabel. However, with 

obabel coord.xyz -o split.xyz --seperate -m


I only get one outputfile split1.xyz containing the whole supermolecule. This is also the case if I enlargen the z-distance between the two molecules. 

Does anybody either:


Know why this doesn't work
Has a different program which I can use


I don't have the time to manually split 500 molecule files.
Not knowing which version you are running, it is difficult to actually help you.

I am using Open Babel 2.4.1, and had absolutely no problem separating the two ethylene fragments from the following file (super.xyz):

12
symmetry c1
C       -0.498388809     -1.662363855     -2.140955132
C       -0.498388809     -1.662363855     -0.810797132
H       -0.498388809     -0.739022855     -2.713905132
H       -0.498388809     -2.585704855     -2.713905132
H       -0.498388809     -0.739022855     -0.237847132
H       -0.498388809     -2.585704855     -0.237847132
C        1.730729269     -0.175065928     -2.629761741
C        1.730729269     -0.175065928     -1.299603741
H        1.730729269      0.748275072     -3.202711741
H        1.730729269     -1.098406928     -3.202711741
H        1.730729269      0.748275072     -0.726653741
H        1.730729269     -1.098406928     -0.726653741


Using the command

$ obabel super.xyz -Ofrag.xyz --separate -m


results in frag1.xyz and frag2.xyz containing one ethylene each.