Umm just one thing. I hope you have unblocked them!
If not go to options or preferences > filters > hosts and there is a window with your blocked hosts in it. If there is only one there.... that is the one! otherwise you do have a problem. You can unblock the host after you make a note of the ip number but this will not reconnect them to you as you need the port number (preceded by a colon
after the ip number 6346 is one you can try.
Without un-blocking you will NOT be able to make contact atall (you may need to unblock all your blocked hosts. ... it depends how many you have
Birdy's suggestion of re-searching for a particular file is probably the best bet.
And I thought I was the only one who hit the wrong button. I was told I should press enter instead