Invoice not being saved...

I've recently upgrade to newest version of the Zencart
But when I receive the order(paypal notification), but I'm not getting notification from online store nor I have any invoice from admin page...

I did receive the Paypal payment.. but invoice is no where to be found....

Also how would I be able to check this??
**Port 80 is used for bidirectional communication with the gateway, so must be open on your host's router/firewall
*PHP allow_url_fopen() must be enabled
*Settings must be configured as described above.

Ask your host about those specifications.

One of my custom told me the problem..

It happens when it's going from Paypal back to my store....

Warning: reset(): Passed variable is not an array or object in /home/content/s/e/a/seanyiya/html/store/includes/modules/order_total/ot_tax.php on line 38

Anyone know what this problem is??

Please get the current v1.3.7 patch to correct this and other issues:
http://www.zen-cart.com/forum/showthread.php?t=69769

NOTE: backup both your site and database before attempting an upgrade ...