problems after updating to v2.3.5

Just upgraded to Cross DJ Pro v2.3.5, and was more than a little dismayed to find my library empty, and all of my playlists giving the message "This playlist does not contain any tracks" when selected.
I can only imagine this means all my saved cue points are gone as well. I haven't moved or deleted any music on my device.
Is there any way of restoring this stuff?
And bonus question: Didn't there use to be a "Folders" tab in the library, along with Playlists/Songs/Albums/etc.? Now it seems that you have to go into the "hamburger" (three lines) menu to get to your folders.
I can only imagine this means all my saved cue points are gone as well. I haven't moved or deleted any music on my device.
Is there any way of restoring this stuff?
And bonus question: Didn't there use to be a "Folders" tab in the library, along with Playlists/Songs/Albums/etc.? Now it seems that you have to go into the "hamburger" (three lines) menu to get to your folders.