Draw.io can't save - "Fehler beim Speichern" (Error while saving)

[Olivier Orlow]

Can't save any changes to a chart. (Button "Save and Exit" does not appear. Only "Save" - but not working)

This happened suddenly today.

Upgraded draw.io to 5.2.1.0 (from 5.1.7).

As administrator i succeed to save change.

@David Benson [draw.io]: I hope you can look at this case here. We are under paid support. How can I log into your service desk?

[Olivier Orlow]

Problem resolved with clearing the plugin cache.

[David Benson _draw_io_]

We'll address the ticket you've submitted.