I use gedit-2.16.1-0ubuntu2 and I can confirm this issue: any attempt to save a file placed on cifs fails with an error message.
I would personally mark this bug with high or even critical priority as the text-editor (in this case the default text-editor in Ubuntu) and its capability to save files is an essential function on every system. -- gedit fails to save files over smbfs/cifs https://launchpad.net/bugs/34813 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs