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For those who are asking, I've just received confirmation from the team that the dual-wielding and Cassia related bugs are fixed in our next patch which should be out some time today. (Tomorrow at the latest).
Edit: I'm really, really sorry! Unfortunately, it looks like they've had to pull the dual-wielding bug fix at the last minute as it introduced some other problems that also need fixing. We don't want to delay the patch for it when the other fixes are ready to go. We will continue working on it.