One other thing...

I have set up my PayPal account so that users having a PayPal account is optional, as instructed in the manual.

The checkout process even shows a logo (graphic) with No PayPal Account Needed.

However, during test purchasing, when being redirected to PayPal, there is no such option (to the end user).

My website has a custom-made retail PayPal purchase option built into other pages, and during checkout, indeed no PayPal account is needed (so that basically discards a discrepancy in my PayPal Seller's options).

What gives?