>Also, I noticed that the color of the icon for a non-frozen
>expanded class is different than the color for a non-frozen
>reference class in my cluster

This has been fixed for the next release.

>Also, the color of a precompiled class icon used to be
>different

We differentiate between read only and non read only classes. Normally all libraries and precompiles are read only and classes in there should have a lighter color than in normal clusters.