Hi @PaddyK, welcome to the forum. What version are you using? Might be best to grab the very latest version and test with that. Instructions are available here:
https://forum-next.cabbageaudio.com/t/latest-beta-packages-available-here-updated-links/114
If you still have no luck you can post the instrument here, and if you don’t want to make it public, PM it to me and I can take a look. 