When there is more than the recurring item in the cart, only the recurring item shows up at Paypal. All other items in the cart are ignored.
The log, seen at: admin/store/orders//log doesn't make any mention of the non-recurring item(s) that were in the cart.
On the same web site, uc_recurring behaves as desired when it is the only item in the cart.
I get same result no matter whether "Submit the whole order as a single line item" or "Submit an itemized order showing each product and description" is set at Payment options => Paypal Website Standard is chosen.
I do have one clue: when there are no recurring item(s) in the cart, the Paypal screen looks recently designed and has choices for buyer to use a credit card OR login with Paypal. When there is a recurring item in the cart, the Paypal screen looks like it was designed a while ago, and it requires a Paypal login.
Might the problem be that this module only works if the web site owner's Paypal business account pays the extra $19.99/month for "Enhanced Recurring Payments"? Is PayPal's "Enhanced recurring payments" for PayPal WPS new?
Thanks for your help, I really appreciate it.