Jean,
I pulled down the latest version of Playmaker today and this method broke from the previous version. To insure that it was broken, I replaced the old PhotonViewRpcBroadcastFsmEvent.cs and it worked again. I'm getting an error on this line:
if (! stringData.IsNone && stringData.Value != ""){
_proxy.PhotonRpcBroacastFsmEventWithString(_photonTargets,remoteEvent.Name,stringData.Value);
stringData is a valid string
I get an object null error (I did not debug it further). But when I replace it with the old version (dated 8/29/2013), it works just fine.
~Caesar