MacBook Air mic is not working with Audition

My MacBook Air mic is working fine for other apps but won't work in Audition. I've gone into audio hardware and set the input properly for the internal mic.   I've gone in the audio mapping and that is set up properly.  I've made sure the input on the project is right.  I've tried recording and no sound.  I cannot figure out what next to do.  Thanks for your help.