Audio/Video in sync but session regions are delayed during playback???

So I have a post audio project with 189 tracks. I've worked in sessions this large before and had no problems.... I'm have audio synced to video, which playsback in sync with the picture. However, The regions seem to be off. When I playback and the playhead scrubs across a region it takes a few more frames until it playes the region.... Wow, what a tough thing to describe. It seems liike theres a delay in the session overall but the audio and video are still in sync....
I thought it could be a processing issue but I'm not even coming close to taxing any of the cores....
Mac Pro 8 core
Logic Pro 9.1.8
Thanks in advance.

Hi People, i have found the answer to my question and thought i might post the cause so anyone else who gets caught can get it sorted.
The answer ended up being that i had an aggregate device as my audio interface (because i have 2 audio interfaces) and so the audio was being delayed in being processed. So i deleted the device in my Audio MIDI Setup (audio page) and thhus, its all good. Quite painfull after a FC reinstall! Ha!!
Cheers

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