From the CLAM thread:
Doog, JD has some bugs now
It turns out when I designed the JD database I thought 2.1 billion bets would be more than would ever happen. We just hit 2.1 billion bets (2^31) so things stopped working.
I've suspended betting and am modifying the database to remove the limitation.
I'll post again once it is done. I've no idea how long it will take, sorry.