There is also another possible reason why this may happen sometimes. If you're using a proxy server instead of a VPN, some of them are a little picky. Simply put, the site is now behind a protection system of its own. Because of this, there is use of JavaScript redirects to be able to properly reach the site and tracker. The down side to this is that if you're running a proxy server that is configured like most, the JavaScript re-direct is lost as it passes through the Proxy on the user's end, which has been known to cause this very issue.
My suggestion here is that if this does not work directly, try it temporarily without the use of the proxy server. If that does work, then I would suggest getting a full VPN service (PPTP preferred), which will still hide your identity the same way that the proxy will, however it tunnels ALL of your internet traffic through the VPN. This allows for maximum protection against copyright trolls, while at the same time, allowing you to still access the site and tracker.
Just a thought…