mrkgnao: This should appear for you "only once" and never again. Has it appeared more than once?
IanM: I think it's working as intended, it does disappear after being dismissed - the problem is I don't keep cookies or active logins so it appears almost every time I navigate to MaGog.
I see. Fair enough.
Expect a fix tomorrow.
Do note, however, that you are also deleting your "local storage" (some browsers do that when you ask them to delete cookies), which is where I keep the flag to make this message appear only once.
This means that as long as you do that you will not be able to use MaGog's "My Fields" feature, which allows you to keep your own information about each game, because that information is kept in the local storage too. It's explained in the tutorial for version 2.x.x.
P.S. Note that by deleting MaGog's local storage you are also losing some other minor features, such as having preferences (checkbox values, https mode, etc.) remembered from session to session.