Mediamonkey skipping tracks

Volumio Information

Volumio Version: 2.861
Hardware: Raspberry Pi

Volumio is happy being served by Twonkey from an NAS, but when I try to feed from Mediamonkey on my PC it won’t play the next track, it gives a click and plays the next-but-one track. So it plays tracks 1, 3, 5 etc… Does anyone else use mediamonkey and can suggest how to fix this?