I just tried it in Cura 15.02.1 (very old version, I don't use it, but I still have it installed). It works fine. Just make sure that lion fits into build volume, otherwise it is grey (in my version). On my first try, everything worked fine, but on my second try it didn't want to make infill and it didn't allowed me to save a gcode. Restarting cura helped. It also takes a while to show toolpath (Loading toolpath visualization 1-100% ).
Repetier host - It doesn't have its own slicer. It uses Cura or Slic3r, so check your settings (If it uses cura than it is no difference than using stand-alone cura).
What is your nozzle size and layer height?