When I change a shape's border radius after editing the vector points, it snaps back to the original shape. Any ideas?
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You might want to try editing the radius of each point individually. You can do that by selecting a point and then choosing the Rounded point mode. You can read more about this here: http://www.bohemiancoding.com/sketch/help/manual/vector-editing/using-the-vector-tool/
I believe it is a bug that you might be facing. I tried doing what you did and it worked fine.
There are however two ways to control radius, one is only on Primary Selection which only gives you overall radius control.
And secondary Selection which allows you to control each point individually by selecting the required point.