Issue Types

Every entry that can appear in the issues list, what it means and what to do.

Track

Issue	Meaning	What to do
Unconnected endpoint	Nothing is joined to this end of a piece.	Expected at the end of a siding or headshunt. If the run was meant to continue, join the next piece.
Misaligned connection	Two ends are close together but do not line up well enough to be a joint.	Move one piece towards the other and let it snap, or use precise placement.
Overlapping track	Two pieces occupy the same space without being a designed crossing.	Move one, or use a crossing piece.
Below minimum radius	A curve is tighter than the layout's minimum radius.	Use a wider curve, or change the minimum if your stock can manage it. See Minimum radius.
Invalid geometry	A piece or flexible run has a shape that cannot be built, such as a run of no length.	Delete and redraw it.

Compatibility

Issue	Meaning	What to do
Mixed scales	The layout contains track from more than one scale.	Replace the odd pieces, or turn on Allow track from other scales if it is intended.
Joined across track systems	Two pieces from different track systems are joined.	Often fine. Check whether that combination needs transition joiners.
Missing track library	Track refers to a library that is not installed on this Mac or embedded in the layout.	Import the library. See Libraries and layouts.

Scenery

Issue	Meaning	What to do
Scenery in the way of track	Track runs through an object that stands on the ground.	Move one of them. If track is meant to pass under or through, set the object's Ground to Spans over it.
Overlapping scenery	Two objects share the same ground.	Move one. Buildings can never overlap.
Scenery sized for another scale	Objects were placed when the layout was a different scale.	Delete and replace them to resize, or leave them if the size is what you want.

Boards and room

Issue	Meaning	What to do
Outside the baseboard	Track or scenery extends beyond a board, into a cutout or across a gap between sections.	Move it, or change the board.
Outside the room	A board extends beyond the room boundary.	Move or resize the board, or correct the room.
Fixed obstacle conflict	A board touches a fixed obstacle.	Move the board, or add a cutout around the obstacle.
Door swing conflict	A wall, board or obstacle is in the way of a door.	Move the board or change the door.
Aisle clearance conflict	A wall, board or obstacle intrudes on an aisle.	Move the board, or narrow or move the aisle.
Reach planning	Part of the board is beyond reach from the edges you can approach.	See Reach Zones.