GWT 2.5 dev mode unable to refresh

Hi guys,

After upgrading to to GWT 2.5 I am unable to refresh my dev mode.  It initially loads fine but reloading (in any browser causes the rpc mechanism to throw this error...

Caused by: com.google.gwt.user.client.rpc.SerializationException: java.lang.RuntimeException: Unable to find class com.google.gwt.user.client.rpc.core.java.util.ArrayList_FieldSerializer

Any idea what would cause this?  As I said again it loads the first time in dev mode but then fails after a refresh (even with no code changes).

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