title: pip: inconsistent permissions issues
body: <p>When installing a package via <code>sudo pip-python</code> (CentOS 6 package: <code>python-pip-0.8-1.el6.noarch</code>), I sometimes get permission issues with the installed packages being readable only by root.</p>
  
  <p>Re-installing again one or two times usually fixes the problem. Has anyone experienced this? Or can anyone suggest any troubleshooting steps to nail down the cause?</p>