Popping in Logic Pro X with 1024 buffer on late 2013 MBP !!! (mavericks)

It used to work just fine, I used to be able to have 128 buffer with no popping. I changed nothing, just booted up my mac today and this BS happens.

I'm using POD GX - all drivers up to date.

I have the late 2013 13" MBP Retina with 8gb of RAM.

As I said, It used to work just fine, and I changed nothing. Please Help !

I checked in Logic Pro 9, same thing, still popping.