Thank you for this. The delete all command does work, but I have to run it every time I resume the preview or I run into the same problem, which feels a little wrong.
Glenatron
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
From
Wales
Post
Replies
Boosts
Views
Activity
I now think that my actions had no effect but the preview system is taking 30-45 minutes to start, and I was assuming that whatever I was doing was having an effect, then the next day I started with that and it didn't work, because the only thing that was working was waiting for an incredibly long time. I have created a Feedback item at FB8988812.