What browser/OS are you using? It might be worth trying a different one, and clearing your cache/cookies.
Are you behind a proxy? If possible, it's best not to be, as (although I'm not sure it applies to the web player as well) I believe that sometimes apps don't work behind proxies.
This post was by Taylor - I do not work for Spotify! If this solved your issue - Mark it as a solution!If you like my post - Please add Kudos! || Spotify Profile - Taylor | Feel free to PM me - Here ||