AccessControl causing data view to be blank if user is logged in without administrator capability

[westguard]

If a data view is accessed when a user is not logged in, or by an administrator, it renders fine.

If a user is logged in with a user role that does not have the administrator capability, the data view is blank.

I suspect this is related to the new AccessControl class?

If no roles / capabilities are specified, i.e. the data view is public, it should allow any logged in user to view it.