Edit time threshold changed?
I recently noticed that it seems like the time limit for a post to be edited without being timestamped as edited seems to have shortened. Is this something I didn't notice as part of the upgrade or was this a recent change to the forums settings?
IIRC I used to be able to edit a post within 10 minutes of posting it without having the edited by timestamp appearing on the post. Now that threshold seems to be 5 minutes or less.
EDIT: check edit timestamp