Doesn't work. Nothing is marked as read
I tested it with a fresh vB3 gold installation. Not even forumdisplay.php?do=markread works properly
I have to users, each made 2 threads. 2 threads (made by user 1) have '1 2' in the database and the other 2 (made by user 2) have 'null' in the database.
The first 2 threads are marked as read.
search.php?do=getnew doesn't find any threads but there are 2 marked as unread