I have a Wordpress 4.1.1 site hosted on GAE and was serving fine yesterday. Today there is all kinds of visual problems with both the site and the wp-admin console. I am seeing this warning in the GAE logs.
PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, first array member is not a valid class name
I got an email about volentary upgrading to php5.5 from GAE today, could that be related? Should I upgrade?
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