And now I also found that installing this plugin (https://bitbucket.org/CDuke/sublime-tfs/src) for tfs makes it save successfully.
I noticed that I get this error every time I try and save a file that is under version control (specifically, I'm using TFS). Files not under version control are ok.
I'm seeing this for files without any directory renaming, I just created a bug for it: http://sublimetext.userecho.com/topic/159512-cant-save-any-file/
Customer support service by UserEcho