Hi legacy_dzynes,
Thanks for bringing this to my attention. I can confirm that the behaviour with setting the eBay site option was a bug. I have released a new version of the plugin to correct this.
Please feel free to update your plugin to v4.0.1 and try again. If you are still having issues with getting your feed to show then please do let me know.
Also please ensure that you have followed the installation steps (found here: https://www.ads-software.com/plugins/auction-nudge/installation/ ) and are not using a adblock browser plugin, as these can cause feeds to not display.
I hope this has resolved your issue, but do not hesitate to post if you require more assistance.
Many thanks,
Joe