When upgrading a D7 site from CiviCRM 4.6.10 to 4.6.11 I run the upgrade script via /civicrm/upgrade?reset=1 and the script isn't running. Instead I'm getting redirected to /user/1
Nothing in the CiviCRM log or the PHP error log. Running on PHP 5.6. The site was a recent clean install using 4.6.10 and I've not noticed any issues up until now.
Where to start debugging this?