Yes, i have the same problem in Google Chrome and in Microsoft Edge. Perhaps is has something to do with the new layout when you want to add coins to your collection.
Is there someone who knows a solution for this?
worth is right to solve the problem: logout, clear your cache and login again.
Sapientiae plerumque stultitia est comes.
Si c'est un grand plaisir d'être reconnu par ses amis, c'est peut-être encore plus flatteur d'être reconnu par ses adversaires.
Be yourself; everyone else is already taken.
Problem solved.