I had been taking advantage of a sound <i>thread mode view</i> for a long time. Suddenly some days ago that configuration option stopped working.
Now when I open a message, all the messages in its thread are displayed. In my control panel I can limit the number of messages displayed (say 10, 15, 25 messages), but I can't set the thread mode anymore.
Do you know the reason for this behavior of SDN's forums?