Title says it all. Currently working through the tutorials. I moved the corner. I hit Ctrl + K. I selected a piece of the already orientated pieces. Hit Shift + Q. Click Piece Selected. Go back to corner piece. Try to replace. Still on Global Snap reference...
In your preferences try changing the 'snap to' grid value to a smaller number eg: 8,16 or 32. Im not sure if thats what you need to make it work but i was having problems with my walls not snapping to each other and changing the 'snap to' value fixed it. Mind you I was working at right angles but maybe it'll help you place yours where you want it.