I am not sure what is wrong... I am now in 10.53, and my 'current' cookie setting is "accept cookies only from the site I visit". Then, I have about 6-7 from Mudcat, and it all works fine.

(Each cookie can be 'edited' separately, as to 'secure' etc., but I have never bothered to mess with those as long as all is working)

Try reading thru the help page on cookies and see if anything is different from your known settings.