Well, that was fucking annoying:

Bad Behavior / Bad Behaviour: Bad Behavior 2.0.11
All users should update to Bad Behavior 2.0.11 immediately to prevent being blocked from your own site.

Within the past two days users have found themselves blocked from their own sites while using recent versions of Bad Behavior. A third party blacklist which Bad Behavior queries recently began sending false positives for any IP address queried, causing everyone using Bad Behavior to be blocked. This issue is fixed in Bad Behavior 2.0.11.