I have a SharePoint 2007 farm (SP2, June Cumulative Update) where the User Profile Import job is now failing. The last log entry on the User Profile and Properties page shows the error message "The parameter is incorrect". This persists whether the job is run manually or via the defined schedule.
What is interesting is that I see it working and running good in that I can see it successfully enumerating the AD profiles and the count goes up to the number I expect. But...it appears that this data is not persisted as I have old accounts still showing up in "Active Profiles" but are no longer on Active Directory. Also I can go to a test server and use the same settings for the import connection and user filter and it runs successfully.
Any ideas on what the problem might be or how to troubleshoot? I have looked at all the logs but nothing has stood out so far and Google searches haven't turned up much on this topic.