I don't know what the issue is. I noticed a few weeks ago that the AppSweep function has completely stopped working, despite being checked off in the System Preferences for Hazel.
I don't know of any third-party app that would interfere. I do occasionally use AppDelete or AppCleaner, but I don't have them set to stay active all the time or activate at startup.
Any suggestions? Uninstall/reinstall Hazel?