I haven't got one, and nor can I get one to work.
Opera has gone through two updates in the past two weeks, and now does not seem to recognise my cookie. It must be there, somewhere, because Mudcat won't reset it, but I can't post as a Guest, nor start threads, nor search. The submit button is missing, as is the search box.
Other cookies work.
Oddly, I transferred my 'Favourites' to Internet Explorer (using it now) and the cookie transferred, along with other cookies.

Any comments or suggestions?