The only known issue with v13.2.15 is that the registry and WMI scanners attempt to scan also non-existing objects. This will be fixed via a module update soon. As for other issues, I'm not aware of other users having reported them with one exception. Please report them to your local ESET support with steps how to reproduce them. If necessary, the support will ask for further logs necessary for troubleshooting. As for a bug-free software, there's nothing like that. We don't live in a perfec