codice:
Find: 

$DB->query("SELECT s.*, t.template, c.css_text
FROM ibf_skins s
LEFT JOIN ibf_templates t ON (t.tmid=s.tmpl_id)
LEFT JOIN ibf_css c ON (c.cssid=s.css_id)
WHERE s.sid=$id".$extra);
--------
Replace with:

$DB->query("SELECT s.*, t.template, c.css_text
FROM ibf_skins s
LEFT JOIN multiforums_templates t ON (t.tmid=s.tmpl_id)
LEFT JOIN ibf_css c ON (c.cssid=s.css_id)
WHERE s.sid=$id".$extra);
----------------
Find: (please note this code is found 3 times in the script and all of them must be found and replaced)

$DB->query("SELECT s.*, t.template, c.css_text
FROM ibf_skins s
LEFT JOIN ibf_templates t ON (t.tmid=s.tmpl_id)
LEFT JOIN ibf_css c ON (s.css_id=c.cssid)
WHERE s.default_set=1");
--------
Replace with: 

$DB->query("SELECT s.*, t.template, c.css_text
FROM ibf_skins s
LEFT JOIN multiforums_templates t ON (t.tmid=s.tmpl_id)
LEFT JOIN ibf_css c ON (s.css_id=c.cssid)
WHERE s.default_set=1");
----------------
Find: 

$DB->query("SELECT s.*, t.template, c.css_text
FROM ibf_skins s
LEFT JOIN ibf_templates t ON (t.tmid=s.tmpl_id)
LEFT JOIN ibf_css c ON (s.css_id=c.cssid)
WHERE s.default_set=1");
--------
Replace with: 

$DB->query("SELECT s.*, t.template, c.css_text
FROM ibf_skins s
LEFT JOIN multiforums_templates t ON (t.tmid=s.tmpl_id)
LEFT JOIN multiforums_templates c ON (s.css_id=c.cssid)
WHERE s.default_set=1");

C'è evidentemente un errore xkè poi nn mi fa aprire qlsiasi forum!
Spero ke riuscirete a trovarlo!
Se nn apporto qste modifike poi nn mi fa modificare il wrapper nel amministrazione per tutti i forum!