This issue was fixed in the 2.0 release published yesterday. It should be resolved now (the Warning line at the top is a guaranteed sign that you're using an older RC version).... certainly if somehow that's still showing up, let us know. Your Authentication Plugin should be version 2.0.2 (that's the 2.0 release version)
As for your other post about logging in on the Joomla side and still seeing a "Connect this account", this is the 2nd time we've seen this and started us thinking... so we made the post linked below for suggestions on why it's like it is, and soliciting feedback on how our users think we should 'fix' it. It's lengthy.. sorry
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