Prime 4 Update DJ 2.0 --> back to Engine 1.6.1?

[Reese]

Rolled back to 1.61 - Now random tracks cause corrupt DB errors in Prime software

This makes no sense, but not in the way you describe it. The 1.x database is migrated to 2.x into a completely different folder and files. That migration is non-destructive to the 1.x database. If you install the old Engine all should be the way it was.

You need to go back to Engine desktop 1.6 as well.