Phpmyadmin doesn't work with other user than www-data?

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http://askubuntu.com – I've changed the user+group where apache is running to my user name so I don't have to change the web files I'm editing. But now I get NoDataReceived error trying to import using phpmyadmin. http://wiki.phpmyadmin.net/pma/FAQ_1.16 What can I do to avoid this problem? When I change back in /etc/apache2/envvar to www-data for user and group it works to import the same file to the same db. I login to phpmyadmin as root. (HowTos)