Unable to load database file

Hello, I have some problems with Recordbox 3.

I use a Macbook Pro and I organize my music collection in iTunes.

The first one is, when I import an playlist/folder from iTunes, Rekordbox crashes while analyzing. I then do a forced stop en restart Rekordbox. Then I get the following message: 'Rekordbox is unable to load database file'. All my music that I imported (about a 1000) is gone, I then have to start over. Why is that? I already tried to use the datafile.backup-file.

The second one is: I import music from iTunes, when it works out, it stays like that for a while. But after a bit when I updated my music collection in iTunes en I re-import in Rekordbox, Rekordbox forgets that the folder from iTunes was already imported en then he imports all tracks over again. So I have everything double.

I have these problems for a while (I think since Rekordbox 2) and would love a fix!