Serviio 2.4 update on QNAP not working properly!

Recently updated to 2.4 on my QNAP NAS and it doesn't seem to be working properly. For example, 1 folder with a music video in i was watching on 1 tv. Went to another and folder now isn't there via VLC player on my Android TV. Folder and contents are physically there. Also 2 new folder created recently with mp4 files in, it reports them as empty despite having multiple files in there??
Not a permission issue as i can clearly see and view these via other devices and utilities outside of Serviio....
Also some files it appears to now struggle to play where the first frame appears and audio is fine but video fails to play properly.
I didn't have any of these issues on 2.3 which i'd been using trouble free for years, what happened in 2.4??
Not a permission issue as i can clearly see and view these via other devices and utilities outside of Serviio....
Also some files it appears to now struggle to play where the first frame appears and audio is fine but video fails to play properly.
I didn't have any of these issues on 2.3 which i'd been using trouble free for years, what happened in 2.4??