I'm not sure if this has been mentioned or not in this thread yet, but there seems to be a rounding issue with some bets.

I placed this one today:
Football    Team Sanders
Team Rice   Under 90   4 hours from now   -107   ฿ 1.07    ฿ 0.99938

Payout should be ฿1.  It's only a ฿ 0.00072 (~$0.60) difference, but that adds up over time and is a bit annoying.