by Howard Miller.
There have been several reports of this over the years and no satisfactory answer. My feeling is that something went wrong during installation and you didn't notice. I would start again.
This time (if you can) create config.php by copying config-dist.php yourself, edit it, and add the settings by hand. Well, down in section 7 you can uncomment some lines to enable debugging.
Then re-run install. Watch for errors!