You have an error in your SQL syntax

[David]

Haz esto:

Código PHP:

die("
SELECT t.tema, t.stick, m.ident, m.id
FROM {$db_prefix}lostemas AS t
LEFT JOIN {$db_prefix}mensajes AS m ON (t.tema = m.id)
WHERE m.ident = '$vlafa' AND t.stick = '1'
ORDER BY t.stick,m.ident DESC");
 

Y cuéntanos qué te muestra en pantalla.