Cannot delete products or attributes from core commerce

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I am unable to delete products or product attributes from core commerce. There is no response (other than a blue border around the button) when I click the red "delete" button for a product, or the "delete attribute" button for a product attribute.

Initially the "delete" worked OK for products, until I checked the pop-up (the one that displayed immediately after the delete button was clicked) that gave the option to suppress any following Pop-ups (or something to that effect).

Now, the buttons don't work, and the pop-up doesn't re-display so I can disable it. :-(

Can someone help me sort it, please?

Thanks,
Gordo

ps. I am running version 2.8.11 of eCommerce on Concrete5 version 5.6.2.1.

gordoweb