Operating system: Darwin-19.4.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 580 OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.8.24
Broken: version: 2.83 (sub 13), branch: master, commit date: 2020-04-11 19:01, hash: rB0a747cd4e3a1
Worked: (newest version of Blender that worked as expected)
Short description of error
If Auto IK is turned on in the pose option and you attempt to move the arm FK controls Blender will crash.
I made a report for Windows too because the issue doesn't crash Blender in that OS but locks the controls where you can not move the arm. Iassuming the two are related but I don't know for sure, so I separated the reports.
*Generate a Rigify Rig
*Enable Auto IK in the Pose options
*Enter into Pose mode
*Click on the Arm's FK control
*Hit G to move