Clipping sound and other things with Logic X 10.0.6

Question

Hi 2 everyones, I notify all about strange things when run Logic X but not only in my new iMac 27" the same in older Mac Pro mid 2008.
In my Home Studio I use with satisfaction this Mixer with USB 2.0 interface.
In this early 2014 change my iMac 21,5" (late 2009) with iMac 27" core i7. From start using Logic X, after recording audio track sometimes the sound distorce, clip and sometimes not.
I’ve try everything (disconnect USB, reset logic,..) but the problem persist.
And another thing that happen in my iMac and other Mac Pro, when (shift+W) edit the audio file with Soundtrack pro (the first time) try to save and return to logic but STP stall (colored whirl), must use forced escape, than re edit and save normally and come back to Logic.
When change from Logic to STP (and reverse) notify center tell me that I’ve change my midi interface but the strange thing is that I deactivate notification center in Logic….. Can someone tell me more??
PS. I read something in this discussion but confusign me too much
Thanks

Answer 1

Ok, the first problem was gone when I completely reset PRAM and VRAM.
But the second is still there. When I open Logic x, and then want to edit externally (with STP) the file (SHIFT+W) edit it and then try to save, STP stall, and I must force quit. Then the second time i re-edit externally the file open it in STP edit, save and that's is fine....why?
Thanks to all forum