Qu-PAD Qu-SB Custom layer not working for Basic user

So I’ve logged in as admin, and set some channels to the Custom 1 layer.
Then when I log in as Basic, on the same iPad, I can see and use this custom layer.
However, if log in as Admin, set Channel Strip Access to Custom for the Basic user, then log back in as Basic, the Custom 1 layer is blank. No channels.
I’ve tried this over multiple iPads and get the same result. Have rebooted the Qu, and reinstalled the app several times.
Running firmware V1.92

Am I missing something obvious? Any one else with the same problem?

Ben