GWT RPC Serialization stops working when migration from 2.4.0 to 2.5.1

I've updated my project from GWT 2.4.0 to GWT 2.5.1 and suddenly a specific RPC serialization has stopped work (all other are still working).

I have this class:

public class StatusChangeMapEntity extends RecordStamp implements Serializable {        private HashMap<WFStatus, Pair<WFPhase, ArrayList<Pair<AppUser, Date>>>> map;      ...      ...  }  

The exception message is:

Attempt to deserialize an object of type class Pair when an object of type class Slide is expected  

The class Slide extends StatusChangeMapEntity and is the object that is being deserialized.

Any ideias how to solve this problems?

Thanks.

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