If it was working before, then the answer is that your arming stick positions (or arming switch position, etc.) is not what it was before.
You can read what your transmitter sticks are saying by looking at the Input page. Make sure you turn off "always armed" first.
For arming with right yaw, the throttle must be zero (not even 5%) and yaw must be 90% to 100% rightward IIRC. Your mixes threw that off. Find out where the mixes are making a problem, or re-run the transmitter wizard. Be aware that the transmitter wizard can't do miracles though...