If its been working for a long time, something has changed. So what has changed? The use of a samba share, what version of samba, where the share is, a setting in Geany, what machine its running on (and you don't mention what operating system Geany is on or the OS of the machine the share lives on is either).

It looks like the clue is in the end of the error message, "file exists". I'm not a windows expert, but I understand that windows will not rename over an existing file, which is what the message says.

See the PHD thesis [here](https://wiki.geany.org/config/all_you_never_wanted_to_know_about_file_saving) and try other file saving settings detailed there that don't rename over an existing file as `atomic_save` does.

Other software (libre office etc) does not use the atomic save method that writes to a temporary then renames it over the original file.

As noted in the thesis both atomic save and GIO unsafe save are provided by Glib library functions, so we don't control what they do, and the option used when neither is set is built into Geany.

Are you really sure you tried setting neither option? The code in Geany does no rename, so its strange you are getting a rename error.

Sorry. I retried the GIO unsafe option an now it works. Thank you for you help :-)