I am trying to create a rule which creates a notification when the monitored folder is empty of all folders and files:

For some reason it doesn't work. When I preview the rule, the 'sub-file/folder' count is correct (it has one folder in it, in this screenshot),

... but the real issue is the 'subfolder depth' shows a crazy high number, even though I am previewing the monitored folder:

Thoughts? Thanks.