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Black Magic Decklink HD and Apple Aperture Issue.
After two days of debugging it looks like the BM HD Link PCI-X card caused issues with some Quartz Extreme and OpenGL rendering core graphics functions, causing the new Apple Aperture on Tiger 10.4.3 (pro photographers app). Apple recommended to remove the card. And as soon as it was gone from the PCI-X slot. Aperture was stable as all can be.
If someone from BM responds I can send the crash log/dump for debugging.