Activating the plugin did work fine and I was able to view the output of the plugin on the plugin admin page after activation. But as soon as I call any further page I get a fatal error from plugin WP System Health:
[21-Nov-2013 17:14:54 UTC] PHP Fatal error: Class 'QM_Backtrace' not found in .../wp-content/plugins/wp-system-health/wp-system-health.php on line 77
Removing WP System Health solves the problem.
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