Originally Posted by
DrByte
Your logs confirm that the customer got to the PayPal site to login and/or enter payment/cc details and returned to your site. That is normal for Express Checkout. But it doesn't normally end there. At that point the customer is naturally returned to your site to choose shipping options, enter coupons, calculate relevant taxes, and then finally confirm payment on your site. It looks like your customers quit the checkout after coming back from PayPal. The logs show nothing more, which means the customer didn't complete the process.
Additionally, the "categories_tree" you see in the logs appears to come from session data created by a simple-category-tree addon you must have installed on your site. I've not used that addon so I can't say for sure whether it's affecting this, but I doubt there's any correlation between it and your paypal transactions at all.
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