Problem: If user is in multiple groups, acl/permissions set for the secondary group will not work.
NOTE: This is solution is for JovianDSS system.
For example. When users primary group is: "asd" and secondary: "zxc".
This user (user1) will not have access to the file/folder which acl is set to the "zxc" group only in which some other user (user2 in the example below) is.
user1: groups=asd, zxc
# file: test_file
# owner: user2
# group: zxc
Solution: Install small update from the link below and reboot.