Hi Alistair,
I'm sorry to hear that error is coming up! Is it possible your file is located on a network drive and not saved locally?
If you still have it open, can you do a Save As to rename the file and save it to your desktop? If all else fails, you can also review your temporary files to see if a recent version can be salvaged. To do this:
- Open this folder in Windows Explorer: %appdata%\Articulate\Storyline
- Scan the contents of this folder for a file that starts with the name of your project. If you find one, copy it to your desktop. If you find more than one, copy the latest version to your desktop.
- Change the file extension of the copy on your desktop from *.tmp to *.story.
- Double-click the file to open it in Storyline.