Melodyne question for Noel

I already had the full Medlodyne suite. The install went great, and i see the full version in ARA. 
 
I used the FX Region for Melodyne on 5 tracks and the clips mostly work fine., However, if I don't always start at the beginning of a MD'd clip, I may hear only one of the 5 tracks. If I stop and start again, this behavior disappears.
 
Any ideas?

Noel:
Here is an example. Same five clips, M78-80, copied to an adjacent measure, M82-84. The first time it runs through, all five tracks are heard. The subsequent set, only the last voice is heard.

 
 

 
 

jamesyoyo
I already had the full Medlodyne suite. The install went great, and i see the full version in ARA. 
 
I used the FX Region for Melodyne on 5 tracks and the clips mostly work fine., However, if I don't always start at the beginning of a MD'd clip, I may hear only one of the 5 tracks. If I stop and start again, this behavior disappears.
 
Any ideas?

Hi James,
 
What buffer size are you typically using in your sessions? If you go to Preferences | Driver Settings, There is a Buffer Size slider (This is grayed out in ASIO Mode) and to the right of it it will list in MSEC and Samples.
 
Let me know what you have there.