This issue can be caused by the cache on the agents or by outdated Smart patterns. To resolve the issue:
Option 1: Purge the cache.
- Unload the client.
- Delete the cache.dat file from the ..\Trend Micro\Client Server Security Agent\ directory.
- Reload the client.
Option 2: Make sure all the pattens are up-to-date, especially for Smart patterns.
- Log on to the WFBS console.
- Go to Updates > Manual.
- Make sure Smart Scan Pattern and Smart Scan Agent Pattern are updated.
- Perform updates from the WFBS agent to get the latest update from now on.