title: Magento upgrade to 1.5 gives a 500 Internal server error
body: <p>I'm trying to upgrade a magento webshop to version 1.5,
  I however keep getting a 500 internal server error.
  pretty much all answers google gives are related to chmodding,
  well this isn't the problem, I've ensured that already.
  Does anyone know what might be the problem?</p>
  
  <p>Thank you.</p>