  We study $\omega$-categorical $MS$-measurable structures. Our main result is
that a class of $\omega$-categorical Hrushovski constructions, supersimple of
finite $SU$-rank is not $MS$-measurable. These results complement the work of
Evans on a conjecture of Macpherson and Elwes. In contrast to Evans' work, our
structures may satisfy independent $n$-amalgamation for all $n$. We also prove
some general results in the context of $\omega$-categorical $MS$-measurable
structures. Firstly, in these structures, the dimension in the
$MS$-dimension-measure can be chosen to be $SU$-rank. Secondly, non-forking
independence implies a form of probabilistic independence in the measure. The
latter follows from more general unpublished results of Hrushovski, but we
provide a self-contained proof.
