Rails can't be selected, linked, etc.

[SunakazeKun]

Rails cannot be selected or linked using the mouse. To edit their positions and properties, I have to select them on the object tree. However, linking them is not possible at all which renders them useless. The rail points appear as blank cubes: I have tried several versions. v1.0.0.0 which is the latest stable release, the "DragAndDrop" build and the "CreateViewGroups" build.