Well I think I'll let the pictures do the talking.
This one sums things up nicely.
If I had to guess, I'd say I didn't exercise the limbs enough. That's what I get for trying to rush things. It could have been a defect in the wood as well, but there was none apparent. I did get one arrow out of it before she blew, a bulls eye none the less. I'll probably try using tulip poplar again at some point. It seemed pretty snappy for that one shot. I'll probably back the next one though.