In the root of the phpBB 3.0.7 install, file search.php, line 899 the code reads:

'S_USER_POSTED' => (!empty($row['mark_type'])) ? true : false,

This basically creates a variable called "S_USER_POSTED" for use in the templates. The variable is set to 'true' if a user has posted in a topic and 'false' if they have not. However, in the database, there is no such column as 'mark_type' in the tables relating to topic-user-posting relationships. The correct column name is 'topic_posted'. Amending the above line therefore allows the variable to be correctly assigned a value of true or false depending on whether a user has replied in a topic or not. Prior to the amendment, the template variable S_USER_POSTED always returns false.

The corrected line at 899 in search.php should read:

'S_USER_POSTED' => (!empty($row['topic_posted'])) ? true : false,