I'm sorry, but I'm afraid, I have to post another bug report (or it's something on my end)

It's from the v0.8.7 beta:

Exception in Tkinter callback
Traceback (most recent call last):
  File "H:ProgrammeSmith MicroPoser Pro 2010RuntimePythonliblib-tkTkinter.py", line 1345, in call
    return self.func(*args)
  File "L:Poser developmentPloppose2lux.py", line 4822, in ExportToLux
  File "L:Poser developmentPloppose2lux.py", line 3959, in ExportGeometry
  File "L:Poser developmentPloppose2lux.py", line 1657, in
  File "L:Poser developmentPloppose2lux.py", line 1096, in write
  File "L:Poser developmentPloppose2lux.py", line 1379, in extract_by_material
  File "L:Poser developmentPloppose2lux.py", line 1383, in extract
  File "L:Poser developmentPloppose2lux.py", line 1342, in init
TypeError: 'list' object is not callable