Although no expert I believe v1.3 is not approved for 10.5 (Leopard). I have been running v1.3 since its launch without problem on an Intel Mac. I am sure v1.3 is good on all OS X versions prior to 10.5. The issue is a risk of corrupting NEF files when saving from v1.3 in 10.5.
I have refrained from moving towards 10.5 because of this issue as I only tend to edit photos on my home computer.
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