If I enable the delete button on the Shopping Cart screen, the button appears, but doesn't work. Clicking it causes the quantity of that item to be set to zero for a fraction of a second, then the screen refreshes and the quantity goes back to 1. Clicking the "Back" button on the browser will display a page where the quantity is zero, but clicking on "Update' will not remove the item - it sets the quantity to 1.

Items can be deleted by manually setting the quantity to zero and clicking 'Update".

What do I need to do to fix this? I viewed the page source in my browser, and see where the quantity is getting set to zero. I don't see anything that would cause the page refresh. I'm assuming that there is something that is running that should be removing the item from the screen with the refresh, but it's setting the quantity to 1 instead.

Thanks in advance for your help.