As I don't see a reason for it, I went ahead and re-opened your thread. I'll also poke mods (in case they don't see this) and perhaps they can explain why if it wasn't in error.
Definitely an error. I apologize for that. If I was the one who locked it, I can only guess that I must've accidentally clicked on something I hadn't intended to. Again, I apologize for the error and I'll be more careful in the future to make sure something like that doesn't happen again.