Cannot connect to .onion sites

When I first downloaded Tor it worked fine but I must have changed something because I now can't access ANY .onion sites. I deleted and reinstalled the browser and am haing the same problem. Additionally, everytime I try to start the browser I get the message that Tor unexpectedly shutdown or a message that another instance is running however neither of these can be the case as the messages appear even from freshly starting my computer.

Trac:
Username: joeypop0309