Move to dir on hosting server gives cache failure

    public function writeFile($filename, $content, $mode= 'wb', $options= array()) {
$fh = fopen('/www/webvol17/40/9cn1xungy6qci7w/test.boxma.se/public_html/debug_log.txt', 'a');
fwrite($fh, 'xpdocachemanager.class.php: Inside writeFile-function.'. ".\n");
        $written= false;
        if (!is_array($options)) {
            $options = is_scalar($options) && !is_bool($options) ? array('new_folder_permissions' => $options) : array();
        }
        $dirname= dirname($filename);
        if (!file_exists($dirname)) {
            $this->writeTree($dirname, $options);
        }
        $mode = str_replace('+', '', $mode);
        switch ($mode[0]) {
            case 'a':
                $append = true;
                break;
            default:
                $append = false;
                break;
        }
        $fmode = (strlen($mode) > 1 && in_array($mode[1], array('b', 't'))) ? "a{$mode[1]}" : 'a';
        $file= @fopen($filename, $fmode);
        if ($file) {
            if ($append === true) {
fwrite($fh, 'xpdocachemanager.class.php: $append = true. $filename:' . $filename . ".\n");
                $written= fwrite($file, $content);
            } else {
fwrite($fh, 'xpdocachemanager.class.php: $append = false. $filename:' . $filename . ".\n");
                $locked = false;
                $attempt = 1;
                $attempts = (integer) $this->getOption(xPDO::OPT_CACHE_ATTEMPTS, $options, 1);
fwrite($fh, 'xpdocachemanager.class.php: $attempts:' . $attempts . ". $filename: " . $filename . ".\n");
                $attemptDelay = (integer) $this->getOption(xPDO::OPT_CACHE_ATTEMPT_DELAY, $options, 1000);
fwrite($fh, 'xpdocachemanager.class.php: $attemptDelay:' . $attemptDelay . ". $filename: " . $filename . ".\n");
                while (!$locked && ($attempts === 0 || $attempt <= $attempts)) {
                    $locked = flock($file, LOCK_EX | LOCK_NB);
if ($locked == true) fwrite($fh, 'xpdocachemanager.class.php: Inside while loop. $locked = true. $filename:' . $filename . ".\n");
if ($locked == false) fwrite($fh, 'xpdocachemanager.class.php: Inside while loop. $locked = false. $filename:' . $filename . ".\n");
                    if (!$locked && $attemptDelay > 0 && ($attempts === 0 || $attempt < $attempts)) {
if ($locked == false) fwrite($fh, 'xpdocachemanager.class.php: usleep. $filename:' . $filename . ".\n");
                        usleep($attemptDelay);
                    }
                    $attempt++;
                }
                if ($locked) {
fwrite($fh, 'xpdocachemanager.class.php: $locked = true. $filename:' . $filename . ".\n");
                    fseek($file, 0);
                    ftruncate($file, 0);
                    $written= fwrite($file, $content);
if ($written == false) fwrite($fh, 'xpdocachemanager.class.php: $locked = true. $written = false. $filename:' . $filename . ".\n");
if ($written == true) fwrite($fh, 'xpdocachemanager.class.php: $locked = true. $written = true. $filename:' . $filename . ".\n");
                    flock($file, LOCK_UN);
                }
            }
            @fclose($file);
        }
if ($written == false) fwrite($fh, 'xpdocachemanager.class.php: $written = false. $filename:' . $filename . ".\n");
if ($written == true) fwrite($fh, 'xpdocachemanager.class.php: $written = true. $filename:' . $filename . ".\n");
fclose($fh);
        return ($written !== false);
    }

xpdocachemanager.class.php: Inside set-function..
xpdocachemanager.class.php: $fileName:./www/webvol17/40/9cn1xungy6qci7w/test.boxma.se/public_html/core/cache/system_settings/config.cache.php.
xpdocachemanager.class.php: Before writeFile-function..
xpdocachemanager.class.php: Inside writeFile-function..
xpdocachemanager.class.php: $append = false. $filename:/www/webvol17/40/9cn1xungy6qci7w/test.boxma.se/public_html/core/cache/system_settings/config.cache.php.
xpdocachemanager.class.php: $attempts:1. /www/webvol17/40/9cn1xungy6qci7w/test.boxma.se/public_html/core/cache/system_settings/config.cache.php: /www/webvol17/40/9cn1xungy6qci7w/test.boxma.se/public_html/core/cache/system_settings/config.cache.php.
xpdocachemanager.class.php: $attemptDelay:1000. /www/webvol17/40/9cn1xungy6qci7w/test.boxma.se/public_html/core/cache/system_settings/config.cache.php: /www/webvol17/40/9cn1xungy6qci7w/test.boxma.se/public_html/core/cache/system_settings/config.cache.php.
xpdocachemanager.class.php: Inside while loop. $locked = false. $filename:/www/webvol17/40/9cn1xungy6qci7w/test.boxma.se/public_html/core/cache/system_settings/config.cache.php.
xpdocachemanager.class.php: $locked = false. $filename:/www/webvol17/40/9cn1xungy6qci7w/test.boxma.se/public_html/core/cache/system_settings/config.cache.php.
xpdocachemanager.class.php: $written = false. $filename:/www/webvol17/40/9cn1xungy6qci7w/test.boxma.se/public_html/core/cache/system_settings/config.cache.php.

                if ($locked) {
                    fseek($file, 0);
                    ftruncate($file, 0);
                    $written= fwrite($file, $content);
                    flock($file, LOCK_UN);
                } else {
	$written= fwrite($file, $content);
}