Hmmm... I don't know why I didn't get the alert about this post earlier. @Luis Pavaneli also sent me a PM and I got that right away.
Well, here's what I told him via PM:
It looks like there's a bug with 1.3.8 that's causing high load. We're working on solving it now, but, until it's solved, it might be best to use 1.3.7.