Geany does not directly access remote files (and never has). It relies on the system mounting the remote file in the Linux filesystem via a suitable (probably FUSE) filesystem driver.
Probably when you upgraded to 15.10 you didn't enable the right remote filesystem handlers, and thats also what the error message is tending to suggest. When you say "right click the file" I assume you mean in the file manager. That allows Geany to read the file because the file manager has mounted it locally, but it can't be saved because either the filemanager dismounts it when you close it, or it doesn't have the right drivers to support writing to the file. --- Reply to this email directly or view it on GitHub: https://github.com/geany/geany/issues/838#issuecomment-166472746
