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When opening a pcb file created in an earlier version of cadint, the preview shows all trace thicknesses correctly but the file opens with all traces at hairline thickness. How do I get the track thicknesses to import correctly?
The track thickness is most likely correct.
Try Setup - Display - True Size Primitives, the top line gives you different ways to present traces.
Please go to Setup->Display->True Types Primitives and select TrueSize for all types