[Alexandre Pollien]

Thank you.
Unfortunately, BMD just answered that:

It appears as though the project has been corrupted as it will not open in a new database.
I am afraid that we are unable to repair this as information can be lost from the XML if it is not closed correctly.
This can happen when the project is not closed correctly causing errors in the project XML.
Resolve is then unable to retrieve or read the XML file in order to open the project.
We do always recommend saving and backing up the project at multiple stages throughout the process and backing up the database so that you can roll back should a project become corrupt.
I would recommend rolling back to your last saved version of the project.

🙁