This error is a recent occurrence since upgrading to the latest version. It happens no matter what file format I attempt to export to or which title I choose to export.
It is a known error?
Exporting error: no argument for format '%s'
One of the messages in the [ExportWin] section probably changed. You could try to check which one, but you'll probably get errors in other Windows/messages anyway.
Using a translation file from an old version is not a very good idea, as you can encounter such errors when parameters in messages change
If you make a custom file just for changing some field names for examples, you should either keep only your modified fields in the file, or (if you want another base language than English) copy your modified fields back to the base English file at each new version.
Using a translation file from an old version is not a very good idea, as you can encounter such errors when parameters in messages change

If you make a custom file just for changing some field names for examples, you should either keep only your modified fields in the file, or (if you want another base language than English) copy your modified fields back to the base English file at each new version.