I've moved to the new version and am still having the same issue this person reported I think. I even found where their cabin should be while exploring near the deep forest, but no cabin appears. I've got a new save from this version that I made to test this, and with them I can find the cabin.
Again, you have to load your untouched version 1.5 save. If you've already loaded the save in 1.6.0, then saved it, then loaded that 1.6.0 save in 1.6.0b, he won't be fixed.
