Hello.
I know this isn’t the prefered solution, but I’ve discovered a small workaround for the realtime preview and chrash problems.
In the timeline settings (right-click on the tab) go to the panel group settings and change it to Stacked Panel Group.
In my case I now get realtime previews and no crashes. But is sucks to work with stacked panels, so I hope Adobe fixes the problem soon.
Kindly Thomas