  We give a new approach to the failure of the Canonical Base Property (CBP) in
the so far only known counterexample, produced by Hrushovski, Palacin and
Pillay. For this purpose, we will give an alternative presentation of the
counterexample as an additive covers of an algebraically closed field. We
isolate two fundamental weakenings of the CBP, which already appeared in work
of Chatzidakis, and show that they do not hold in the counterexample. In order
to do so, a study of imaginaries in additive covers is developed, for
elimination of finite imaginaries yields a connection to the CBP. As a
by-product of the presentation, we notice that no pure Galois-theoretic account
of the CBP can be provided.
