Subtle random pops

[Ozman]

Is any one else hearing occasional subtle occasional random pops ? I've just spent hours editing a vocal line - I might play a phrase seven or eight times and one or two times there's a pop that wasn't there before and then its gone again. Sometimes happens at the beginning of phrases, sometimes after previously successful crossfades. This in a solo vocal project. Small file, one processor. I have recently upgraded to 8.0.1 from 7.4 for the midi editting, but am beginning to wonder if I've gone backwards in other areas.
On the other hands, perhaps my hearing is finally going.

Melodyne is also giving more obvious pops where it hasn't done before but that's another matter. I have taken this up with Celemony.

System is
mac i24, 2.31 Ghz, 3 GB Ram, 003 factory, OSX 10.5.6, PT LE 8.0.1

I've done the usual cleanups etc. Any suggestions much appreciated.


Thanks

Richard P