I'm not sure which version of Zen Cart you're using. Granted, this problem doesn't appear to be related to version issues.
In my first read of your post, I interpreted it as though you were saying that if someone places an order, you don't see it until the next day.
In this case, it could be that the PayPal servers are just overloaded and slow in responding. When using the IPN module, the order isn't "released" in Zen cart until PayPal's servers notify you of the completed payment.
You can read more about how all that works here:
http://www.zen-cart.com/wiki/index.php/PayPal#How_Does_IPN_work.3F
What puzzles me is the date discrepancy. So, I re-read your post a couple times, and looked at the dates you posted:> Date Added Customer Notified Status Comments
02/19/2007 17:53:17 Processing
02/19/2007 17:53:17 Processing PayPal status: Completed @ 18:52:03 Feb 18, 2007 PST
So the order date is 2/19/2007 but the payment date is 2/18/2007This suggests that your webserver maybe has the wrong date ?
I can see 17:53 vs 18:52 being typical if there's simply a 1-hour time-zone difference between PayPal's servers (on West Coast of USA, in PST zone) vs your server, presumably in a time zone further west by 1 hour.
But then there's still the date issue vs the time issue.
So, it would appear that your server is set 23 hours ahead of the PST time zone ... thus causing the discrepancy.
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