Unexpected deletion of directory

view story

http://askubuntu.com – I find that somehow the Downloads directory in /home/user/ is deleted. on using $locate Downloads, it shows the existence of directory without any existence of files within. now when i manually create directory named Downloads, $ locate Downloads shows the directory as well as the files the original folder had. also there is no hidden Downloads folder nor can i access the folder or its files this behavior is quite unexpected .... please help. (HowTos)