MyBook Thunderbolt Duo config to JBOD fails

Plugged in new 6TB Duo. When I attempt to configure as JBOD (HFS+J), it fails with message ‘Failed to set the drives in JBOD configuration.’ Mac running 10.10.5 Yosemite. Have used both current and older versions of WD Drive Utility. Thanks for any advice.

Sorted. Upgraded OS to El Capitan and all OK.

I’m glad this has been resolved.

I am on El Capitan already. Getting same message. No idea how to resolve. Any ideas? I’m using a May 2015 Macbook Pro on el capitan with the WD My Passport Pro (4 TB). And WD Drive Utilities is giving me this error: “Failed to set the drives in a JBOD configuration.”