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I have a save where this is reproducible, if I let a colonist finish building a steel wall, she freezes up in the manner described in this thread, spitting a bunch of errors at me afterwards, then her pathfinding goes haywire and there's no way to move her.

Here's the save.

https://drive.google.com/open?id=0B2pmJXycsnR2Z0VQTXdGMm5DZEE