heh, not if you can't open the conversation>> Observation, not sure if you've all seen this. It appears that *all* the messages render properly if you hit "Reply" from the Conversation View.
i just got part of your bug: in conversation view, trying to open a conversation containing a known bug-causing message. the conversation doesn't open, but the view menu shows only "reading pane", as if it had made it all the way into the conversation. like you say, successfully doing something else resets the view menu