Hi there, I was busily correcting DRC errors by adjusting track clearances when all of a sudden all my top layer red coloured tracks vanished. All I have showing now is like the 'Silk' layer and none of the components can be moved. It's as if something has locked the board and removed the visibility of all the top layer tracks. Can anyone suggest how to fix this? I attach an earlier version showing what it was looking like and then the current view. Thanks Julian