PayPal payment object in Sparkle 5.0.1

Trying to get the PayPal buttons to work in Sparkle 5.0.1. I added a Payment object into the page then configured it for PayPal. I have a sandbox account in PayPal so I figured I’d try that out first to see how it goes.

At first, all went very well. Dropped the object onto the page and configured it and it seemed fine. Then I closed the project and reopened it again later and the graphic has disappeared from the screen. The object is still there and it’s still selectable and I can play with the settings but on the screen, it just shows the background color. Worked through all of the settings and I’m not seeing anything that pops out. Any suggestions?