projects missing

After upgrading to the latest Aperture version the complete library had to be upgraded. This took days and it ended up in a crash.

After restarting Aperture it look like this :

All photo's are still present if I click on the menu photo's. But the projects remain empty.

I have tried all possible recover options, like rebuilding database etc, still no luck.

Is there a solution for this?

Regards,

Dennis