Unable to save settings issue

Any 3rd party plugins enabled? Please check if the issue is reproducible when the custom ones are off (Preferences | Plugins | Show: Custom).

Same problem here, opening a project on a SMB share, mounted through Gnome VFS. This used to work before, now it doesn't anymore. Disabling custom plugins doesn't solve it. Can it be something path-related? The VFS mount has a few special chars in it (because Gnome), and the first corresponding error in idea.log seems to indicate something like that: https://pastebin.com/RhD82dbt .

I hope this gets sorted, because right now I cannot use PHPStorm at all.

Edit: for completeness' sake: I'm running PHPStorm 2017.4 on Fedora 27.

Hello,

Unfortunately, working with remote files directly, via network, is not a supported scenario.
PhpStorm has been designed to work with local copy of the project. Find more info about this approach here: <https://www.jetbrains.com/phpstorm/help/working-with-web-servers-copying-files.html>.

You can check the valid scenarios and configure synchronization with remote server by following this guide: <https://confluence.jetbrains.com/display/PhpStorm/Deployments+in+PhpStorm>.