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Changes between Version 1 and Version 2 of Ticket #15458, comment 42

-                      v1
+                      v2
 {{{
+$this->caps = &$this->data->{$this->cap_key};
+$this->caps = $this->data->{$this->cap_key};
+if ( ! is_array( $this->caps ) )
+        $this->caps = array();
 }}}
 That line in WP_User::_init_caps() is somehow causing cache pollution.  wp_cache_get($id, 'users'), as done in get_userdata(), will sometimes return an object with the wp_xxx_capabilities property set ( where xxx is the current blog id).  The value is an empty array.  This confuses get_blogs_of_user(), which sees that the property is set and mistakenly thinks the user belongs to the current blog.  Since the cache clones objects on set and get this is rather unexpected.
+Those lines in WP_User::_init_caps() are somehow causing cache pollution.  wp_cache_get($id, 'users'), as done in get_userdata(), will sometimes return an object with the wp_xxx_capabilities property set ( where xxx is the current blog id).  The value is an empty array.  This confuses get_blogs_of_user(), which sees that the property is set and mistakenly thinks the user belongs to the current blog.  Since the cache clones objects on set and get this is rather unexpected.