Mail.app keeps saving downloads to Mail Downloads rather than ~/Downloads
I've modified Mail.app preferences to save downloads in the main downloads folder, ~/Downloads. But every time I double click an attachment, it still downloads to the wrong folder, Mail Downloads, in a terribly nested directory, ~/Library/Containers/com.apple.mail/Data/Library/Mail Downloads.
I've tried restarting Mail.app, I've tried restarting Mac OS X, to no avail. This is starting to smell like a constant's set somewhere, instead of referring to the current application preference.
Mail.app-OTHER, OS X Mountain Lion (10.8.4)