For me it seems more os issue rather than Resolve. I have seen this pram problem on imacs with Lion. Some stuff did not work out the box after update to Lion. Can not say that it is not affecting other stuff.
But ok i do not have very dedicated info how this pram stuff works in detail.
Good test would be to use demo footage from Resolve image and test with these. Then other people could also take part of your testing.
I have 470/4000 Lion machine here and have not done any pram stuff yet.
Interesting idea to test out.
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Margus
https://iconstudios.eu