PHP Fatal error: constructNormalButtons

[eugenp]

This occurs not only in conjunction with W3 Cache but also with other caching mechanisms (such as the WPEngine custom caching mechanism): PHP Fatal error: constructNormalButtons() [function.constructnormalbuttons]: The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition "DD_Twitter" of the object you are trying to operate on was loaded before unserialize() gets called or provide a __autoload() function to load the class definition in /nas/wp/www/cluster-1266/cristi/wp-content/plugins/digg-digg/digg-digg.php on line 114, referer: http://www.craftycristian.com/

This seems to have been reported a number of times: http://wordpress.org/support/topic/plugin-digg-digg-error-in-normal-display-page-after-upgrade?replies=10 http://wordpress.org/support/topic/plugin-digg-digg-fatal-error-with-floating-display?replies=19 But it's still unsolved in version 5.3.0 Thanks.