jax versions 0.5.1 to 0.5.3 seem to cause issues for symmetric protein generation using salad. salad works as expected for versions 0.5.0 and 0.6.0. I am therefore pinning jax to version 0.5.0 for now ...
This version of reduce is being replaced by reduce2, which is integrated into the CCTBX project as described at https://github.com/cctbx/cctbx_project/tree/master ...