1. Quit Safari.
  2. Open Finder.
  3. Click the Go menu while holding down the Option key and select Library.
  4. In the window that appears, go to Safari > LocalStorage.
  5. Look for any files whose names begin with "safari-extension_com.betafish.adblockforsafari-" and delete them.
  6. Open Safari.

If AdBlock works, great! If it doesn't, 
please let us know!