The newproducts works fine with 4.3.1
Attached are the 2 files i use on 4.3.1 which are
My X-Cart home directory - newproducts.php
My X-Cart home/skin1/customer/main/newproducts.tpl
I have also included my X-Cart home/skin1/customer/home_main.tpl file as this is a new shop and not been changed yet.
And you can view this at
http://www.nightscene.co.uk/shop/newproducts.php