Issue with wp Dashboard widgets area

I had a plugin installed and not exactly sure if this is the time i noticed the error or not. I added the plugin RPX (the plugin that adds open id’s to the log in page (for facebook, windows live…gogle and such)) and since then I can’t drag and drop new widgets to the sidebars… nothing happens… except for the fact that the widget I tried moving… copies itself in the first slot of the widget area (on the left) Hope someone can guide me