Apon using the advanced search feature for the line "SELECT * FROM phpbb_mps WHERE mps_id =" in modification forums, with options 'search subforums - yes' 'post subject and message text' and 'display results as posts' the results page displayed the following...

In overall_header:

[phpBB Debug] PHP Notice: in file /includes/functions.php on line 2364: strpos() [function.strpos]: Empty delimiter.
[phpBB Debug] PHP Notice: in file /includes/functions.php on line 2364: strpos() [function.strpos]: Empty delimiter.
[phpBB Debug] PHP Notice: in file /includes/functions.php on line 2364: strpos() [function.strpos]: Empty delimiter.
[phpBB Debug] PHP Notice: in file /includes/functions.php on line 2364: strpos() [function.strpos]: Empty delimiter.
[phpBB Debug] PHP Notice: in file /includes/functions.php on line 2364: strpos() [function.strpos]: Empty delimiter.
[phpBB Debug] PHP Notice: in file /includes/functions.php on line 2364: strpos() [function.strpos]: Empty delimiter.

Also highlighting in results was messed up with 90% of words highlighted and template appeared to be malfunctioning.