We have problem for only one user:
He works a lot on files stored on server, mostly pdf and autocad files. Sometimes he deletes files and they are deleted from server, but when he refreshes directory, files come back. They don't exist on server anymore, but user can still see them.
It appears randomly, and mostly with pdf files.
He has full control over directories he works with.
He uses Windows 7 x64 pro, AutoCAD 2014 and Adobe Acrobat XI Pro.