No problems here either. I know that they changed it over a few months back so that you had to be signed in to eBay in order to use this feature, otherwise they just request that you sign in.
clear cache worked.
It's wired though. I had 3 PCs and all of them suddenly stopped working for completed search. That made me think the problem might be at ebay's side.
Anyway, it works now.
Thanks for the advice 🙂