Playhead freezes during playback and no fader levels (Logic 8)

during playback on my powermac g5, it's a legit version from a studio.
playhead freezes and stops moving all together untill i pause and press play to refresh position.
This is happening with some but not all projects;
happening on a reasonable sized project, it contains 22 tracks overall, 16 are audio tracks (without excessive plugins) the rest of the tracks are various synths.
(i have checked the core overload and neither core is overloading and i am using the audio channel trick for the VSTs to balance it out between cores.)
got 10 bus sends but again nothing huge on them, just reverb here or there and basic FX and group EQ.
finally nothing on the master channel bar a EQ that is just analysing Freq.
I'm also not getting any fader levels at all during playback, this might be from the same issue?
the software isn't lagging at all just no playhead movement and no repsonse from faders, i've most probably pushed a button since i've recently moved over to logic from ableton on a PC.
let me know if i'm the moron or if it's a bug/something
Version No. 8.0.2

Actually, I must make correction, it is not the core audio error, it is the disk too slow error.

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thejazzdiva wrote:
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I have not had this issue before, and am thinking this is a capacity issues, since its is a holiday weekend and many folks are trying to do playback, and its just not enough bandwith?
I did not have this issue before when I was not on the X1 platform.
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Playhead freezes during playback and no fader levels (Logic 8)

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