EXS 24 Logic Sampler Users Group

Hi Folks,
I guess this would be considered OT, but on the other hand the EXS is  
somewhat involved.

I've got 3 tracks going in Logic Pro 7.2.1 on a MacBook Intel laptop.

1 audio track, 1 EXS with a bass sample, and 1 track of a stereo  
Apple Loop.
Also while recording the audio track I had a PreSounus FaderPort  
attached through the USB hub as well as a Metric Halo 2882 through  
the firewire port. (BTW, this FaderPort gadget is really cool!)

I recorder with this set up for a few days with no glitches at all.  
After that I backed up my data to a CD ROM disc. I then relaunched  
Logic to do some mixing and out of the blue I get "error trying to  
sync audio and midi". Everything is out of synch and it seems like  
the audio is playing back at a different sample rate. Also in the  
error message is something in regards to trying to recognize a sample  
rate of 4800. the Metric Halo and Logic are both set to 44.1 So I  
quite Logic and pulled the FaderPort and still got the same message.  
So, I decide to take the Metric Halo out of the configuration and  
play through the internal mac sound system and I still get this  
"synch" error.

This morning I try it again and still get the same error. I play a  
DVD in the machine, come back to the Logic project in question and  
all of a sudden no errors!!

Anybody have any wisdom concerning this bizarre behavior?

Thanks for your time!

Dennis