Right, it's well into the Autumn now, and I'm on v10.0.1 and still getting the 451 queue file write error. It's been happening since the beginning of v9, and people keep saying that it will be fixed in 9.0, 9.2, 9.3, 9.5, 9.5.1, 9.5.2, 9.5.3 and then now "in the autumn". But now I am on v10.0.1...