Playing score renders echoes or "flutter" MS 4.3.x

On a freshly installed Ubuntu Studio 24.04 I installed MS 4.3.1. However existing scores playing fine on other platforms including Kubuntu and Windows 10/11 are rendered with what sound like echoes - or flutters -throughout the entire score. Ubuntu Studio comes with MS 3.x pre-installed, and this works fine. When exporting scores with the failing 4.3.1 to Wave or mp3 files these are played flawlessly. Anyone have an idea? I have enclosed a sample recording.