Hi!
I upgraded my site successfully from 3.1.2 to 3.1.3, but i got this message after trying to do anything (editing post, saving a new post, deleteing a comment etc...), BUT everything works fine, i mean: after refreshing or clicking back in the browser i see the new post or the edited content.
I looked in to the files, i didn't found any blank spaces or any bad characters.
I'm dunno what to do now, any help would be appreciated.
"Warning: Cannot modify header information - headers already sent by (output started at /home/www/clients/client497/web949/web/wp-config.php:1) in /home/www/clients/client497/web949/web/wp-includes/pluggable.php on line 897"
Did you do a manual upgrade of only the changed files? I did so with the result of a similar error. Manually upgrading all of the files fixed it. I don't know why. I might have copied one or more the files to the wrong location.
Also note that 4 files have a recent modification date but were not listed as modified in the 3.1.3 update. They may not affect this problem, but they are:
wp-admin/network.php
wp-includes/class-wp-xmlrpc-server.php
wp-includes/ms-files.php
wp-includes/version.php
I did an automatic update.
I copied now manually the files, still the same error message.
Open your wp-config.php file with a text editor and delete and extra whitespace at the bottom of the file, after the ?>.
I did, still the same error, btw there was no "?>" at the end but i added to it. Checked it with Dreamweaver too.
Try disabling all of your plugins and see if that helps.