Possibly a blocker.
Well crafted search terms can log the profile2 tool out leaving a login page inside the tool. Rebooting server does not help the specific user
Search term <script>alert('xss');</script>
Press clear history
Click away to another part of the profile 2 tool.
Locked out of profile 2 tool even after login or reboot of server for that account
Could you be using part of the search term as part of the URL or some such?