I installed this plug-in and it worked fine, but the next day I notice that I was getting "No items to display" where the listing images should appear.
I check the Widget and notice that it gives the error "You have exceeded your quota of: 20000 requests per 86400 second(s) for public requests." under the "Show items…" option. I registered for a new developer API key to see if that would help, and it worked again… until the next day when I got the same error again.
Any ideas why this would happen? I have it set to update every 24 hours, so it should barely be hitting Etsy at all.