Created attachment 399800 [details] Screenshot Ok, this is a bit hard to explain, so I'll upload a screenshot as well. If you select Threaded view of your messages, collapse a thread and select the top message, the thread will be shown in Newspaper style. No change the window layout from either Classic to Vertical or Wide. Now try changing it back. You can't After selecting a single message or after expanding the thread you can change the window layout. Steps to reproduce: - Enable threaded view - Collapse a thread - Select the top message - Change the view to a different one - Try changing it back to the previous layout Expected result: - The change back is successful Actual Results: - The change back fails.
Confirmed here on 3.0b4pre