Logic TDM TDM Error -7100 ?

#1
This happens on a couple of songs now every time I open them, and when I insert or remove plugins.

G5 Dual 2
PTHD3, 192 interface
Songs at 48k 24 bit.
OS 10.4.11
Logic 8

Any ideas? It doesn't seem to be causing a real problem (the action I start is always completed successfully, after I remove the Error message). It's just "worrisome".
 
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