Even though Peerblock is a good thing to have as a first line of protection in blocking unwanted attention from bad IP's trying to access your PC,some times Peerblock does block good sites IP address's,as it seems to be doing now with torcache.com,and causing problems for the members of ET d/loading some torrents.
If you are having this problem or similar See this
If you follow the steps below this should fix this issue