Got the error message again after updated on 2.8.5.:
Warning: gzinflate() [function.gzinflate]: data error in /var/www/html/web133/html/band/wordpress/wp-includes/http.php on line 1787
Warning: gzuncompress() [function.gzuncompress]: data error in /var/www/html/web133/html/band/wordpress/wp-includes/http.php on line 1792
P.S. The error massages appeared erratically from the beginning but they might have disappeared after I uploaded the hacked http.php. But the main problem is the missing CSS format which makes the admin area nearly unusable.
I can’t reproduce them but they where about http.php.