It wont let you into any full world. It makes you wait like everyone else. it just lets you refresh the page without having to go back to the main homepage.
I dont remember what year or month it was but I do remember creating my character and not getting on it until 2 days afterwards and because of that I didn't get a yo-yo.
Did you look at the picture... if the person is still trading you they cant be far away. On-topic: I've had that happen once. I just logged out and logged back in.