@rmuk We have some incremental improvements regarding both the App Simulator (formerly Zero Iteration/ZI) and HandTracking in our September Software Release - #2 by sengelman.
Can you confirm if this still occurs with a fresh installation of the Magic Leap Hub and the App Simulator?
There should have been a template available with this Category that pre-populated some fields for versions. Those things would speed up the process.
Can you confirm, after upgrading, your versions of the following:
Unity editor:
Unity SDK version:
Magic Leap Hub version:
Magic Leap App Simulator version:
This page will also explain how to retrieve diagnostic logs that you can send to use, where we can get the best inference of what may be happening.