menu.inc and PHP 5

// Line 356 of file menu.inc
if (strlen($arg)) {
$arguments = array_merge($arguments, explode('/', $arg));
}

Please change to
if (strlen($arg)) {
$arguments = array();
$arguments = array_merge($arguments, explode('/', $arg));
}

This is an issue in 4.6.3 and 4.7.0 Beta 3. I am not going to report it again as a 4.6.3 issue if not asked to.

If you are running AstBill at http://astbill.com and PHP5 there is an array issue if the line
$arguments = array();
is not added.

We added this line long time ago in the drupal distributed with astbill. It have been tested a lot. The astbill project is using a more complex menu structure than must applications.