This is pretty minor but it's a regression from 2.0.4 so I thought I'd mention it.
Create a new document and use the Letter or A4 preset. Note that the Margins are set to 1,1,1,1.25 and the lock icon is shown deselected as it should be. Click Create.
Click Document Setup. Note that the Margins are set to 1,1,1,1.25 but the lock icon is shown selected which is incorrect.