Paddy Ou commented,
Thanks for your answer. It's oddly started to work after I changed the sounds to Garritan instruments and then back to Garritan JABB 3.
Paddy Ou created a post,
I installed the 'Jazz and Big Band 3' Garritan library into Finale v26 (Windows 10) using the steps from this link: https://makemusic.zendesk.com/hc/en-us/articles/217663758-Setting-up-Garritan-lib...