[Plugin: Janrain Engage] Quirky results re login and re permissions

I’ve made several attempts at incorporating a social login, trying your plugin, SFC, and Social Connect. Your’s has come closest to working for me but I’m still getting too much inconsistency for me to use it, especially re Facebook. First, when logging into my site using the FB icon, users get an FB log in window requiring their password even when they are already logged into their FB. (these results were obtained using three different FB accounts from the same PC) Second, sometimes users get a message that says they have insufficient permissions to access that area. Any help you can give me would be appreciated.

http://wordpress.org/extend/plugins/rpx/