It appears that your firewall may be blocking Box.net or you are encountering an error.

Please contact your IT administrator to configure your firewall to recognize all sub-domains of .box.net and .boxcdn.net. The ports that should be opened for these domains are 80 and 443.

If that does not resolve the issue, then please submit a support ticket at http://www.box.net/help.
Manage and Share your files online securely with Box.net. Sign up now. Have a Box account? Log In
Help › Can't see Collab Folders?

If you were invited to collaborate but you cannot see the 'Collaboration Folder,' please contact the person who invited you to re-invite you using the email address associated with your account. After that, you will then see the option to 'Accept' or 'Reject' the invitation on your 'All Files' page.

If you are a 'Guest' user please note you will be unable to see Collaboration Folders which were not created by the owner of the account associated with your log in credentials. To gain access, please contact the owner of the collaboration folder to provide you 'Guest' or 'Collaborator' access to the folder.
View your public Box