Import external playlists very slow in mAirlist 7

After the upgrade from v6 to v7 I’m having issues with importing playlists from an external scheduler (Station Playlist Creator).
First of all it takes > 30 minutes to import the playlist for one week and second I get error messages about invalid content when saving the playlist
import1
import error

This was not a problem with mAirlist v6 using the same SPL version and file format.
There the import takes just a couple of minutes.
Anyone who can help me with this?