The VPJ save file was corrupted. Look for another in this path...
[C:\Users\[user name]\AppData\Roaming\NCH Software\VideoPad\autosave.vpj.](http://C:%5CUsers%5C%5Buser%20name%5D%5CAppData%5CRoaming%5CNCH%20Software%5CVideoPad%5Cautosave.vpj.)
If not found, do a PC search for .VPJ. If you have saved routinely that should discover many VPJ files. The most recent will be your best bet.
Save Project File AS routinely, giving it a unique # or name, so as not to overwrite prior saves. Using Save Project Files (no AS) will overwrite. From the HOME tab, the AS choice is available by clicking the caret to the right of the Save Project button on the toolbar. That way you're protected, and shouldn't lose anything.