N3 and KORE player

I use the free KORE player from Native Instruments. It works fine in Sibelius, but it's a bit choppy in Notion - notes keep getting missed out during playback, giving me odd silences.
It happens when I export as audio too.
Any ideas? It could be KORE's fault of course, but since it works in Sibelius, I'm doubtful...
It happens when I export as audio too.
Any ideas? It could be KORE's fault of course, but since it works in Sibelius, I'm doubtful...