I think I can confirm the error with avx version on Mac.
JVERSION
Engine: j807/j64/darwin
Beta-f: commercial/2018-06-28T12:14:57
Library: 8.07.16
Platform: Darwin 64
Installer: J807 install
InstallPath: /users/brian/j64-807
Contact: www.jsoftware.com
(cube D.1;cube D.2; (cube=: ^&3"0) D.3)y=: 2 3 4
Segmentation fault: 11
logout
Saving session...
...copying shared history...
...saving history...truncating history files...
...completed.
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