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.

A windows utility app Ive written that sits in your system tray and notifies you when you when you get updates to your timeline.