title: Plone restart after buildout fails. How to find the error
body: <p>lately I have been trying to customize my Plone by adding helpful addons via the eggs section of my buildout.cfg, running <code>buildout</code> and restarting the zeocluster <code>plonectl restart</code>.
  I have succesfully installed several addons this way.
  But some stop Plone from working. For example trying to add <code>plone.app.ldap</code>:
  buildout works fine and also the restart of the server works initially, but when accessing Plone in the browser it doesn't load and <code>plonectl status</code> tells me my two clients have lost connection to the zeoserver. The events log tells the same story, but other than that I do not see which error caused the problem. When i remove the addon everything works fine again.</p>
  
  <p>Is the way I am handling my addons correct? Did I miss something? Where can I find additional information what crashes my zeocluster?</p>