Postsmoothing backbrojector no longer works

When Reconstructing images with PSF using the below, images are saved empty:

projector pair type := Separate Projectors
projector pair using separate projectors parameters :=
forward projector type := Pre Smoothing
Pre Smoothing Forward Projector Parameters:=
original forward projector type := Matrix
Forward Projector Using Matrix Parameters :=
Matrix type := Ray Tracing
Ray tracing matrix parameters :=
number of rays in tangential direction to trace for each bin :=10
do symmetry 90degrees min phi := 0
End Ray tracing matrix parameters :=
End Forward Projector Using Matrix Parameters :=
; image-based blurring
filter type := Separable Cartesian Metz
Separable Cartesian Metz Filter Parameters :=
x-dir filter FWHM (in mm):= 4.4
y-dir filter FWHM (in mm):= 4.4
z-dir filter FWHM (in mm):= 4.4
x-dir filter Metz power:= 0.0
y-dir filter Metz power:= 0.0
z-dir filter Metz power:=0.0
; truncate it a bit to avoid negative lobes
x-dir maximum kernel size := 5
y-dir maximum kernel size := 5
z-dir maximum kernel size := 1

END Separable Cartesian Metz Filter Parameters :=

End Pre Smoothing Forward Projector Parameters:=
back projector type:= Post Smoothing
Post Smoothing Back Projector Parameters:=
original back projector type := Matrix
Back Projector Using Matrix Parameters :=
Matrix type := Ray Tracing
Ray tracing matrix parameters :=
number of rays in tangential direction to trace for each bin :=10
do symmetry 90degrees min phi := 0
End Ray tracing matrix parameters :=
End Back Projector Using Matrix Parameters :=
; image-based blurring
filter type := Separable Cartesian Metz
Separable Cartesian Metz Filter Parameters :=
x-dir filter FWHM (in mm):= 4.4
y-dir filter FWHM (in mm):= 4.4
z-dir filter FWHM (in mm):= 4.4
x-dir filter Metz power:= 0.0
y-dir filter Metz power:= 0.0
z-dir filter Metz power:=0.0
; truncate it a bit to avoid negative lobes
x-dir maximum kernel size := 5
y-dir maximum kernel size := 5
z-dir maximum kernel size := 1

END Separable Cartesian Metz Filter Parameters :=
End Post Smoothing Back Projector Parameters:=
end projector pair using separate projectors parameters :=

Start by reproducing the reported reconstruction with the supplied Separate Projectors configuration, including Pre Smoothing and Post Smoothing using Ray Tracing matrices and Separable Cartesian Metz filters. Trace the projector-pair and smoothing entry points to determine why the resulting images are empty; done means the same configuration saves non-empty reconstructed images.