Mariano Martinez Peck wrote:
> What questions is, what are these faults?  Why a method dictionary can 
> be in nil ? How is this produced ? And how is it fixed?

These faults are messages generated by the VM when a class has no method 
dictionary. Why? Because it can be used to discover which classes are used.

> But again...how can that be nil ???

See ClassDescription>>induceMDFault.

Cheers,
   - Andreas