Why is playhead out of sync with audio ? logic X 10.1

LPX 10.1 Playhead is ahead of actual audio, it is slight but enough to throw me off when looking at transient I want to edit, while playing back.
It does not play ahead in LP 9.
Late 2013 Mac Pro (trash can). Yosemite 10.10
when I set audio setting to internal it is still ahead coming out of trash can speaker so it is not interface.

If you are finding poor performance with LPX in Yosemite....
This 'trick' seems to fix it...
1) Open a terminal
2) Enter and run the following command, entering your password when prompted:
sudo nvram boot-args="debug=0x10"
3) Restart the computer
if that doesn't help then do the following instead...
1) Open a terminal
2) Enter and run the following command, entering your password when prompted:
sudo nvram boot-args="debug=0xd4e"
3) Restart the computer
I've been testing this (the first one) all day and so far it has worked very well indeed... but as always, such 'tricks' are used at your own risk...

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1.    I created a “software simulation” project. It IS a capture+audio recording.
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I really appreciate your help.
Sincerely,
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Why is playhead out of sync with audio ? logic X 10.1

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