title: JMeter save listener configuration as xml not working
body: <p>I try to save the output file of a listener (doesn't seem to matter which kind of listener, but I try the 'View Results Tree' listener) as xml. I can check the 'Save as Xml' flag, and when I then run the jmeter plan, without closing the gui, I get an xml output. As soon as I close the gui and I try again the output changes to csv, but in the jmx file itself there is still an xml element true for that ResultCollector. I have the same issue when I run headless.</p>
  
  <p>I tried changing the jmeter.properties to</p>
  
  <pre><code>jmeter.save.saveservice.output_format=xml
  </code></pre>
  
  <p>and that seems to do the trick, but that would likely mean that I cannot output csv format anymore. Is the 'Save as xml' broken? I've got this with jmeter 2.11 r1554548, which seems to be the last stable one from the site of apache. </p>
  
  <p>I suppose this isn't expected behaviour? Anybody experienced something similar? I can reproduce this from scratch, consistently.</p>
  
  <p>Kasper</p>