title: index.yaml is not updating
body: <p>I expect the index.yaml file to update with the necessary indices when I run queries in my development environment. It claims that it is updating this file in the dev server log, but the file doesn't actually change. Any idea what might be going on?</p>
  
  <p>Here is the entire index.yaml file:</p>
  
  <pre><code>indexes:
  
  # AUTOGENERATED
  
  # This index.yaml is automatically updated whenever the dev_appserver
  # detects that a new type of query is run.  If you want to manage the
  # index.yaml file manually, remove the above marker line (the line
  # saying "# AUTOGENERATED").  If you want to manage some indexes
  # manually, move them above the marker line.  The index.yaml file is
  # automatically uploaded to the admin console when you next deploy
  # your application using appcfg.py.
  </code></pre>
  
  <p>The log has several of these lines at the points where I would expect it to add a new index:</p>
  
  <pre><code>INFO     2010-06-20 18:56:23,957 dev_appserver_index.py:205] Updating C:\photohuntservice\main\index.yaml
  </code></pre>
  
  <p>Not sure if it's important, but I'm using version 1.3.4 of the AppEngine SDK.</p>