Absolutely!
Also:
On a vanilla 1.5.1 installation the function sizeof($selection) is only called for in the file includes/modules/payment/paypalwpp.php - around line 2647 for the first time. That function does not seem to appear in any other vanilla install payment module.
The thread indicates that you are using v 1.5.0 - am I right? If so, upgrade to 1.5.1. That version has had a few changes to the PayPal related files. Upgrade from 1.5.0 to 1.5.1 is an absolute breeze unless you have made major modifications to the affected files.
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