DDL Import Wizard has issues with 'SelectAll' / 'DeSelectAll'

When re-importing (to update an existing model), the final page of the import wizard (difference report) seems to have issues with node selection.

If a node is unchanged, you cannot select or de-select it, but when you press the 'unselectAll' button it will unselect it. After it is un-selected, you cannot reselect it.