I get the following when running the sallen_key demo (note that this is a development build, so it may be some packaging that's missing):

Circuit: KiCad schematic
Original line no.: 5, new internal line no.: 113:
Mismatch: 0 formal but 1 actual params.
Copies=121 Evals=120 Placeholders=0 Symbols=7 Errors=1
Numparam expansion errors: Problem with input file.
Error: ngspice.dll cannot recover and awaits to be detached
******
** ngspice-26 shared library
** Creation Date: Mon Jan 22 15:04:02 GMT 2018
******
dlopen(/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/ciderinit, 2): no suitable image found.  Did find:
/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/ciderinit: file too short
/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/ciderinit: file too short
Error: Library /Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/ciderinit couldn't be loaded!
dlopen(/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/spinit, 2): no suitable image found.  Did find:
/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/spinit: file too short
/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/spinit: file too short
Error: Library /Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/spinit couldn't be loaded!
dlopen(/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/devaxis, 2): no suitable image found.  Did find:
/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/devaxis: file too short
/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/devaxis: file too short
Error: Library /Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/devaxis couldn't be loaded!
dlopen(/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/devload, 2): no suitable image found.  Did find:
/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/devload: file too short
/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/devload: file too short
Error: Library /Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/devload couldn't be loaded!
dlopen(/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/spectrum, 2): no suitable image found.  Did find:
/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/spectrum: unknown file type, first eight bytes: 0x2A 0x20 0x46 0x6F 0x75 0x72 0x69 0x65
/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/spectrum: unknown file type, first eight bytes: 0x2A 0x20 0x46 0x6F 0x75 0x72 0x69 0x65
Error: Library /Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/spectrum couldn't be loaded!
dlopen(/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/setplot, 2): no suitable image found.  Did find:
/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/setplot: file too short
/Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/setplot: file too short
Error: Library /Users/jeff/kicad_dev/kicad/bin/kicad.app/Contents/PlugIns/sim/ngspice/scripts/setplot couldn't be loaded!
Error: there aren't any circuits loaded.