Maya 3.5 OSX

I've created a Spline IK handle on a jointed model and thereafter created a cluster to limit the effect of the Spline IK. However, in the Deformer Set Editor I cannot access/edit the weights of the individual CV's in the cluster. I can see the individual CV's in the Deformer Sets window just not edit the weights.

Has this moved in 3.5?

Is this a bug in the OSX version?

Dexter