My problem: upgrading to WordPress 3.2 worked flawless, the sites worked as before, admin is even nicer than before.
I disabled all plugins, switched to twentyten and twenty eleven, ‚reset‘ plugins folder, no chance.
So I had a look at my sites error log and found:
PHP Fatal error: Call to undefined function json_encode() in /srv/www/vhosts/mysite.com/httpdocs/wp-admin/includes/class-wp-list-table.php on line 905, referer: http://mysite.com/wp-admin/edit.php
Clearly to see: undefined function json_encode() called by wp-admin/edit.php
Checking my phpinfo() there was no json to see! So on my plesk 9.5.4 json is not enabled!?
The vServer is running on plesk 9.5.4 on a suse 10.3 with php 5.2.11-0.1
To enable this json stuff I found you need json.so and json.ini in folders mentioned below.
Looking on the servers root there is no json.so in \usr\lib\php5\extensions\ and there is no json.ini in \etc\php5\conf.d\
Lucky I found the correct rpm packet ‚php5-hash-5.2.11-0.1.i586.rpm‘ here:
I downloaded this .rpm, opened up with 7-zip and copied the two included files to the folders they should be in. (using winscp)
After a Restart VPS in my Virtuozzo Panel I went back to my sites phpinfo to find a new entry:
json support enabled
json version 1.2.1
Now back to the dashboard of WordPress 3.2 checked if the visual editor in Edit Post is working now? YESSSS!
wordpress 3.2 no visual editor