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That old way to get the profile picture stopped working with the last couple of Facebook API updates. In order to get the profile picture now you would need to use the ajax plugin and either my free Facebook core plugin(non mobile) or cranberrygames plugin for mobile platforms. Once you log in using on of the plugins just mentioned, make an ajax get call to the following address
https://graph.facebook.com/me/picture?r ... ess_token={User Access Token from mine or cranberrygames plugin}
This returns a JSON array that you can parse to get just the url value. IF you are not good at that, you could just use the tokenat system expression to strip it down to just the url you want.
Of course you can also pick up my user information plugin to streamline the information. It's compatible with Cranberrygames plugin as well. You can pick it up at http://lockegames.com