Copy step won't delete my folder

I have a step that attempts to delete a directory tree. It is a subroutine call to a Copy step that has a blank source folder and a destination folder that is the value of a temporary parameter from the subroutine call.

Under the Copy tab, Include is set to *.*. The Copy recursive, Copy empty, and Delete destination are checked.

Under the Options tab, Log files, Ignore non-exstant, restartable, Keep read-only, and wait for share names are checked. The folders to be deleted are all on the local drive.

Sometimes I get messages like:
*EXTRA Folder: Bin
*EXTRA File: Visual C++\Interfaces\Services\DBStatus.IDL

These are not deleted (but some files are deleted). Sometimes it works completely. I can write the DOS command to do this, but I figured I'd give VBP a shot at it. Why are my targets sometimes not deleted?