oh you have the php 5 issue.
replace the line 524 of admin/index.php which is
PHP Code:
$ftype = strtolower(end(explode('.', $file)));
in 1.4.2 with these lines
PHP Code:
$ftype_exp = explode('.', $file);
$ftype_end = end($ftype_exp);
$ftype = strtolower($ftype_end);