@ville, there’s a newer version of Local 5.x available here:
5.0.7 (Beta)
I’m not guaranteeing anything but making sure that you’ve got the known bugs out of the way is a good first step.
Are you importing from a site export from 5.0.6 or version 3.x? I don’t believe the betas should have a separate SQL for each table, but version 3.x did.