Orders not showing, when using Website Payments Standard

I use zen cart v1.3.9e and paypal with PayPal Website Payments Standard - IPN.

But today 50% orders missed in the panel but they had paid from paypal.

Why so many order missed? big bugs???

My site is: http://www.digitopz.com/

So many thanks for your kindly help!!!!!!!!!!!!:clap:

Is this a fresh install or was an older version upgraded

fresh install

Try copying your ipn module settings to notepad
remove it and re-install it
Replace settings and check the logging box
Logs will tel you where they are failing

Or use the better express module

Remember that if your using the IPN that the customer MUST return to your site to complete the order.

If a user gets done paying at paypal then closes the browser the system doesnt know that there was an order placed

Merlin is right.

Recommendations:
a) switch to the more contemporary and reliable PayPal Express Checkout, instead of Website Payments Standard.
(Website Payments Standard relies on having perfect communications between PayPal's servers and your server. If anything goes wrong in that process, your store will never receive their notifications. Express Checkout doesn't have to rely on that for completing orders properly, and as such is more reliable. Plus, unlike WPS, Express Checkout doesn't have to wait for the customer to click to return to your site to complete their order, as Merlin mentioned.)

b) If you insist on staying with WPS, there are several troubleshooting steps you can take: http://www.zen-cart.com/wiki/index.php/PayPal

I have seted auto-return to on from paypal, maybe this can deal with my issue.

many thanks!

The better solution is to use Express Checkout.