setting a variable to value of workflow.getInputParameters().keys not working in 5.5.2 ? Debug code attached.

The following code is blowing up for me since upgrading to 5.5.2 .  It seems like setting a variable or iterating through the values from workflow.getInputParameters().keys is not working.  Create a scriptable task with this code and see if it blows up in your face.  It does in my environment and is crippling us.  May have to roll back to a previous version.  If someone else can verify this I'd appreciate it.  Also attaching a workflow.  I have two passes through since it seemed to work once through a couple of times but always failed on the second iteration.  I think if I completely bounce the vCO server (not just the service) it will actually set the variable once but after that it will always blow up on me.  Run the workflow a couple of times in a row.

System.log("workflow.getInputParameters() first run: " + workflow.getInputParameters());

System.log("workflow.getInputParameters().keys first run: " + workflow.getInputParameters().keys);

for (var i in workflow.getInputParameters().keys) {

  var curKey = keys[i];

  //print out properties in format key :::: value

  var curValue = workflow.getInputParameters().get(curKey)

  System.debug(curKey + " :::: " + curValue );

}

System.log("workflow.getInputParameters() second run: " + workflow.getInputParameters());

System.log("workflow.getInputParameters().keys second run: " + workflow.getInputParameters().keys);

for (var i in workflow.getInputParameters().keys) {

  var curKey = keys[i];

  //print out properties in format key :::: value

  var curValue = workflow.getInputParameters().get(curKey)

  System.debug(curKey + " :::: " + curValue );

}