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why does IMAQ Init stop with fatal error?

I sometimes get the following message:
Exception occurred in IMAQ Init.vi, node 0xD64. Memory may be corrupt etc. etc.
My application is acquiring an image from an IMAQ PCI 1407 card, running IMAQ 2.5.4 with IMAQ Vision 6.1.0 on Win NT 4.0 SP6.

IMAQ Init vi failes in Imaq Register New Session, but if I run a subvi of the IMAQ Init the problem disappears (temporarily), and the vi will run again.

Support engineer suggested replacing the IMAQ card, but the replacement has not solved the problem.
It looks like some configuration or timing problem.

Any other suggestions?
cheers,
Simon
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