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It's solved for anyone who doesn't believe in magical "free will". If it's possible for Omega to correctly predict your action, then it's only sane to one-box. Only decision systems that deny this ability to predict will two-box.
Causal Decision Theory, because it assumes single-direction-causality (a later event can't cause an earlier one), can be said to deny this prediction. But even that's easily solved by assuming an earlier common cause (the state of the universe that causes Omega's prediction also causes your choice), as long as you don't demand actual free will.
I agree that it's clear that you should one box – I'm more talking about justifying why one-boxing is in fact correct when it can't logically influence whether there is money in the box. Initially I found this to be unnerving initially, but maybe I was the only one.