Continuation of this thread that was closed by a moderator:
https://community.ebay.com/t5/Report-eBay-Technical-Issues/Item-Page-Watch-Button-Dropdown-for-Custo...
Same problem as the opening post, though site has been updated style wise since then.
I've tried different browsers, clearing cookies, logging out and in multiple times. None of that resolves the issue.
It would appear that waiting three years is not the answer either ... so any other ideas ?