Yesterday i've tried to migrate a 2.5 model to 18.104.22.168. During the migration at the moment of saving the project my connection was lost and so it seems that mendix lost all modules except the system module. I can't open the project in 22.214.171.124 and because it's a multideveloper project, it seems the only way to solve this problem is to restore a db backup. Am I right?
If you were in the middle of a convert-in-place while your connection was lost your database will indeed be corrupt. Hence you need to restore a backup.