Claims based authentication and security trimming search results

I recently enabled claims based authentication (NTLM only at the moment) on a few existing SharePoint 2010 QA web applications.  I used a couple powershell commands to migrate user accounts so that all of my site security would be maintained. 
So far so good.    The issue is now my search results are no longer security trimmed.  If I do a search I get results for everything, including content I don’t have permission to view.    I have checked with several other
users and they are also seeing all results.   If they click on a site they don’t have permissions on they do get access denied.

Any ideas why search would not be trimming the results based on user security?

(this is not FAST search).