**Bug introduced in 10.0.0 and fixed in 10.1.0.**

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Has anyone had problems with the `DeleteMissing` function in *Mathematica* 10.0.2? I find that it rarely works. Most of the time it returns a list which still contains all of the missing elements. For example, let's say `a = {Missing[], 1, 2, 3}` then `DeleteMissing[a]` returns `{Missing[] , 1, 2, 3}`.