IgorMan

I solved this problem!
Module Json must be enable in PHP v.5.2.x settings. By default settings – json is disable.
Thanks to all! ;)))

What do you advise me?

Change the theme, deactivating plugins does not help to solve this problem.

I have new infomation, I didn’t see it early:

Fatal error: Call to undefined function json_encode () in wp-admin/includes/class-wp-list-table.php line 905

in class-wp-list-table.php line 905:
“printf( “<script type=’text/javascript’>list_args = %s;</script>\n”, json_encode( $args ) );”

My PHP version: v5.2.10

Yes, I have these problems too!