title: QtCreator won't open any project after a crash
body: <p>After a crash of QtCreator it won't open any project anymore.</p>
  <p>If I try to open a project (that worked perfectly well before the crash) the QtCreator seems to ignore me (I tried several ways of opening a project through the QtCreator).</p>
  <p>If I open the QtCreator directly via a *.pro file it opens the project file as plain text without any syntax-highlighting.</p>
  <p>If I try creating a new project it tells me &quot;<em>No valid kits found</em>&quot;. None of the solutions I found to this problem helped me, though.</p>
  <hr />
  <p>To fix the problem I've tried:</p>
  <ul>
  <li><p>restarting the Computer ;-)</p>
  </li>
  <li><p>cloning the auto-detected compiler settings and verified each path</p>
  </li>
  </ul>
  <hr />
  <p>I'm using <strong>QtCreator 3.0.0</strong> with <strong>MinGW 4.8 32bit</strong> based on <strong>Qt 5.2.0</strong> (all precompiled)</p>
  <p>I would like to avoid a reinstallation of QtCreator, if possible.</p>
  <hr />
  <h3>Solution:</h3>
  <p>I fixed the problem by myself - I figured out one of my config files got corrupted; see full answer below.</p>