[assassingod]

You can try this, it's untested but it may work:

Open forumdisplay.php, find:

PHP Code:

unset($imodcache); 


Below, add

PHP Code:

if($forum[forumid] == 27) {
    $headerlink = "forumdisplay.php?forumid=27";
} else {
    $headerlink = "index.php?s=$session[sessionhash]";
} 


Then in the header template, find:

index.php?s=$session[sessionhash]

(First one)

and replace with

$headerlink