First of all, when updating GWT SDK you should delete your gwtUnitCache directory. Historically there has always been some hiccups with the cache when upgrading GWT. By deleting it you make sure to start a fresh compile without any cached information.--
If that does not help you should take the stack trace you see in the browser console and put a break point at the location calling your GWT-RPC service methods. This is just to verify that the GWT-RPC method is really called with non null parameters as you would expect. Maybe that is not the case.
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