Cuesheet not playing right on Synology. What am I doing wrong?

I've got some albums that are there as a WAV, with individual tracks identified through a cue sheet. This used to work great on 7.6.1. But with my new NAS (Synology DS1812+) I'm stuck to either 7.7.1 or 7.7.2. I've tried both versions, but neither seem to be able to play albums that are comprised of one wav-file that is split up through a cue sheet. The strange thing is that the tracks are identified correctly by LMS and they show up in the screen as individual tracks, but once you select them, it will always be just one song that gets played. And not even the first one, on some albums it's the second, on others it's another track. Very odd.

These same albums never gave me trouble on my old NAS with 7.6.1, so I think I can rule out that factor.

Am I doing something wrong? Is this a know issue with the 7.7.x server?