The static checkbox of a Dimension Chain is a tricky thing because it may not show the whole picture.
If there is at least one Dimension point in the Dimension Chain that is not static then the Static checkbox will not be set to ON.
Try this: create a static Dimension Chain. Then select it and add one Dimension point to the Dimension Chain by CTRL-clicking a node of an element.
Now that Dimension Point of the Dimension chain is dynamic, but all other Dimension Points are still static so they won't update when you move the Dimension Chain.
Also, once a Dimension Point is set to Static, you cannot turn it back to Dynamic again. You have to delete that Dimension Point and recreate the dimension. After all, how it is supposed to know what point of which element it was associated with after it was set to Static?
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