gridrec in tomopy.recon() produces Segmentation Fault (11) on MacOS 10.14.5, py3.7.3

[schlepuetz]

Describe the problem
Running tomopy.recon() with the gridrec algorithm results in a segmentation fault (11) on MacOS 10.14.5 and python 3.7.3. All other algorithms seem to work fine.

To Reproduce (if applicable)
Install the tompy short course (https://github.com/tomography/tomopy-short-course) conda environment.

Run the following commands in that environment (assuming you have already created the simulated data file):

In [1]: import tomopy

In [2]: import dxchange

In [3]: prj, flat, dark, ang = dxchange.read_aps_32id('data/data-simulated.h5')

In [4]: rec_fbp = tomopy.recon(tomo=prj, theta=ang, algorithm='fbp')
Reconstructing 4 slice groups with 4 master threads...

In [5]: rec_gridrec = tomopy.recon(tomo=prj, theta=ang, algorithm='gridrec')
Reconstructing 4 slice groups with 4 master threads...
Segmentation fault: 11

Platform Information:

• MacOS 10.14.5
• Python Version 3.7.3
• TomoPy Version 1.5.2 py37h770b8ee_2 conda-forge

[TristanDoherty]

I have the same segmentation fault 11 when performing a gridrec reconstruction:
MacOS 10.14.6
Python 3.7.4
TomoPy 1.7.0 py37h3020249_100

as well as:
MacOS 10.14.6
Python 3.6.9
TomoPy 1.5.2 py36h770b8ee_2