Audio Unit (AU) Validation Failure In Logic Pro

Hopefully somebody out there can assist?
I am having trouble validating AU's in Logic Pro. The AU's in question are Access Virus TI and Waves GTR both of which had previously passed validation but for some reason Logic decided to re-run the validation exercise and has now failed them! The problem cited is some sort of 'buffer overrun'. All other AU's (mostly NI Komplete) of which I have 60 odd pass OK. The problem does not stop the failed AU's working within a project I'm working on but nonetheless confusing and irritating.
The only software I have installed and therefore change to my setup that may be conflicting somehow is the loading of Finale.
Any assistance to correct the problem would be greatly appreciated.
Cheers,
Chris
Mac G5 Mac OS X (10.4.4)

Appreciate the heads up Rik. Have searched posts and realised the problem is as you say with the os update. Should have cloned but didn't! No harm done as AU's seem to work just fine by forcing them to load without validation. Cheers, Chris

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