In 2.3.2, this molecule renders oddly. It places 3 atoms exactly on top of 3 other atoms, which makes it look like two independent rings are fused, and makes an apparent ring that is not really a ring at all.
obabel -:'OC(c1ccnc(c1)NC/C(=N\Cc1ccccc1)/SC(=O)C1CCNCC1)O' -osvg > /tmp/bad_struct.svg
This has been resolved in the development code -- there are a number of improvements in layout.