ciao prova a modificare page_header.php da:

[php]
$url_in = array('/(?<!/)viewforum.php?f=([0-9]+)((&)|(&)){0,1}([^>]+>)(.?)</a>/e',
'/(?<!/)viewtopic.php?p=([0-9]+)((&)|(&)){0,1}([^>]+>)(.?)</a>/e',
'/(?<!/)viewtopic.php?t=([0-9]+)((&)|(&)){0,1}([^>]+>)(.*?)</a>/e');
[/php]

a

[php]
$url_in = array('/(?<!/)viewforum.php?f=([0-9]+)((&)|(&)){0,1}([^>]+>)(.?)</a>/e',
'/(?<!/)viewtopic.php?p=([0-9]+)((&)|(&)){0,1}([^>]+>)(.?)</a>/e',
'/(?<!/)viewtopic.php?t=([0-9]+)((&)|(&)){0,1}([^>]+>)(.*?)</a>/e');
[/php]

ciao avevo anch'io lo stesso problema ed ho risolto modificando il codice di page_header.php da

[php]
$url_in = array('/(?<!/)viewforum.php?f=([0-9]+)((&)|(&)){0,1}([^>]+>)(.?)</a>/e',
'/(?<!/)viewtopic.php?p=([0-9]+)((&)|(&)){0,1}([^>]+>)(.?)</a>/e',
'/(?<!/)viewtopic.php?t=([0-9]+)((&)|(&)){0,1}([^>]+>)(.*?)</a>/e');
[/php]

a

[php]
$url_in = array('/(?<!/)viewforum.php?f=([0-9]+)((&)|(&)){0,1}([^>]+>)(.?)</a>/e',
'/(?<!/)viewtopic.php?p=([0-9]+)((&)|(&)){0,1}([^>]+>)(.?)</a>/e',
'/(?<!/)viewtopic.php?t=([0-9]+)((&)|(&)){0,1}([^>]+>)(.*?)</a>/e');
[/php]