Okay, I've found a total of four problems and can't ascertain if it's the theme (eStore) or the plugin(Simple PayPal Shopping Cart). These issues have all started to occur after upgrading the theme and the plugin to their latest versions.
the four issues are:
- Green 'Add to Cart' button that's associated with each product page doesn't work at all when clicked.
- generic 'Add to Cart' buttons are published unexpectedly on product posts and other non-product pages.
- the Shopping Cart Page I published to summarize what's in a customer's cart (using the plugin's short code) doesn't work and has an unexpected 'Add to Cart' button on it (charging 19.00 for an 'add to cart' item - yes it's bizarre).
- the Shopping Cart in the sidebar/widget area doesn't maintain an accurate inventory of products as they're added and removed, when browsing from page to page.
I tried different plugin versions. I removed v3.5 of the plugin; then installed v3.2 of the plugin (I found in my PC's archive folder) and continued to have problems; then I upgraded back to v3.5 and still had problems. This leads me to believe there may be an issue with the latest theme version I installed.
Has anyone recently upgraded their eStore theme as well? Is anyone experiencing the four problems I've identified?