I cannot Login

Hi,
I have two great problems with this plugin.
First: I cannot login. I write my user name and password, appear a window with an operation to solve (until this all ok) and after I have to rewrite user and password, and this cycle is infinite! I cannot enter in my blog!
Second: The widget in the sidebar doesn’t exist anymore, and I cannot se my profile page…
Some ideas?
Thanks!

The page I need help with: [log in to see the link]