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I'm using Mac OS X. Compiling it from source sounds a bit extreme as a solution, but I can consider trying that too.

Yes, sounds very much like that. I can copy-paste into the box, and indeed, it comes out nicely in the PDF. However, to copy-paste everything all the time is not really a solution I think.

The character set that works is indeed latin1 and not ASCII, as things like öäå come out normally.

I was testing LyX earlier but this problem made me to give up. However, I thought to give it another try as it worked so well otherwise. I'm very new in both LaTeX and LyX so I apologise if I've missed something very obvious.

I saw there is some earlier discussion about interlinear glosses. If I ...