Wiki_History doesn't work.

Hello,

I've purchased Wiki plugin and still try to figure out how I can work properly.
I tested Wiki's History function on twenty eleven theme(defualt theme).
As you can see on the link below,
http://blodel.com/?incsub_wiki=2nd-wiki-test&action=history,

1) Compare Revisions: doesn't work. It always goes previous archive page.
2) Restore: doesn't work. It shows me the message like below even if the page exists.
"Wiki page you are looking for does not exist. Feel free to create it yourself."

Please confirm those functions.

Thanks.