Just upraded to N4, having new audio problems

Greetings,
I just upgraded from N3 to N4 and am noticing a couple of issues with the audio I didn't have before (i'm using the same files). 1) pops and clicks 2) a low, growling distortion (even at pp dynamic) I'm using the same pc I used before. Any ideas?
-tim
I just upgraded from N3 to N4 and am noticing a couple of issues with the audio I didn't have before (i'm using the same files). 1) pops and clicks 2) a low, growling distortion (even at pp dynamic) I'm using the same pc I used before. Any ideas?
-tim