8.3.4 When nesting flex containers that need scroll bars, sometimes the designer stops displaying the scroll bars until the play button is pressed. Has anyone else experienced this or have a workaround?
I just came to report this same thing. In my case I have an outer container with a scrollbar and when I scroll to the bottom, then select an inner container, the scrollbar disappears. Closing/reopening the window or going in/out of preview mode (which jumps the scrollbar to the top) are the only ways I've found to get the scrollbar back.
Here is a screen with the scrollbar:
Then select an inner container, no scrollbar:
On 8.3.7