I am running TDS 3 and ProcessGuard. I only installed PG yesterday on this PC and since then have gone through the learning phase with several subsequent reboots. Some other programs have been upgraded without problems earlier today (ad-aware). Just now when I had another reboot and then manually started TDS3, I got an alert by PG that dcsmutex.exe has changed. Any idea why this file has changed? TDS has not been upgraded apart from the daily definitions Obviously denying this file means that no mutex scan is being done.