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Ah, brilliant. Works for me on 4.3.3, too.
Sorry to double post, but just in case any happens across this and has the same issue:
It looks like this is a bug in 4.3+. Here's the bug on the...
Contact support (http://unity3d.com/company/contact). It's unlikely that anyone on the forums can do anything for you.
I'm at a bit of a loss at the moment with a terrain lightmapping. It's been a bit of an afterthought to a project we're working on, so...