It dawned on me that when I moved those threads out of the Shelter over the weekend, I forgot to lock them in the Thread Release subforum. When I went to do that a little while ago, I discovered that none of the released threads were locked, going all the way back to 2007 or so. They're all locked now, 66 pages worth. I guess it was a glitch caused by the change in board software.
That's what I thought was strange. At first I was locking each thread individually and I noticed that some of the ones that had been released when you still owned the board were unlocked. I started going back further and further and found that all of them were unlocked.