Camera Raw. Can't move mask or adjust size of mask (E.g. Liner gradient or radial gradient)

In Camera Raw, I can no longer adjust the size of a liner gradient mask or a radial gradient mask. The size lines/box that shows the mask area are first there when making the mask however as soon as I click to place, the lines/box disappear and I can no longer adjust the mask at all.

The attached image is of a liner gradient mask after being placed (red area). As you can see no adjustment box is present so I can not adjust the size of the mask at all as I could before.

Please do let me know if this is a bug or an easy fix I am missing. Thanks.