Is this issue reproducible? because maybe there was a delay between when you have pressed "Log in to last.fm" and your browser trying to display last.fm web page (maybe you didn't noticed that the page was already opened)
Is this issue reproducible? because maybe there was a delay between when you have pressed "Log in to last.fm" and your browser trying to display last.fm web page (maybe you didn't noticed that the page was already opened)