Comment 3 for bug 1416636

you can follow the progress here: https://github.com/mixxxdj/mixxx/pull/629
MK-42 has started to privatize the Library access, in a way that future code is forced to use the new API.
I am currently working to merge master step by step into the branch.
We are still fighting various concurrency issues.
Any comment or help is welcome.

You may fix this bug by directly call the database assuming it will be done asynchrone in a Database thread.
We have to delay the merge until the database theads is available.
Or you may target the solution to MK-42 branch. This way you may get familial with it and you may find issues on the way.