Did another test.
More weirdness.
Created a personal message topic.
Replied to it with admin.
Flagged the pm topic requsting a deletion of the whole thread.
Received the flag message as admin.
Selected All - the 2 posts basically.
‘Deleted all’ and it only deleted the first post.
Had to go down to the next post; ‘selected down’ which selected it; deleted it and the delete went through.
It’s a bit too temperamental for comfort to my mind please.
Still no progress on the over 1000 posts PM thread.
Thank-you.