OpenBabel 2.3.1 and 2.3.2 do not have SVG and PNG output capabilities for reactions. When choosing SVG output babel claims having converted one file and creates an empty SVG file [bug?], when using PNG output, babel says "0 output files created".
How to reproduce: Take the attached file or pentoceph.rxn and run
$ babel chlorbenzene.syn.rxn chlorbenzene.syn.svg
or
$ babel pentoceph.rxn pentoceph.svg
Reproducible: always [Linux using command line, Windows with GUI]