Am i the only person that gets persistent buffer errors with sample based VI's

[The Dougfather]

Hi all, i have been struggling with this issue for many months now and i just don't seem to be able to find many others in the same boat.

Every time i boot up my machine and load a session with a sample based VI (Structure LE, Kontakt Player etc) i get a buffer error at the point where the session reaches the VI:

-9073 = Original Mbox
-6086 = 002R

From here on i can tend to resume playback but the buffer errors can crop up at any time, noticeably after i've changed patch.

I've tried restoring my Macbook back to OSX 10.4.9 running a standard 7.4 install with only Structure LE additionally installed and i still get the error. Even if it's only one midi track and structure in the session it still throws it.

My system is completely optimized as per the thread and i record to an external FW drive.

Anyone found a way round this one?