I don't have any rail pieces in my inventory. Now when I activate the rail from my hotbar, it activates in ghost building mode. I then click on the arrow of an existing rail segment and it shows the outline of the rail to be built in green, but I'm unable to actually place the rail or ghosts. Nothing at all happens when I click, no ghosts but also no error.
*edit* Of course, when I press shift, it does build ghosts, but this behaviour is inconsistent with other ghost building operations.
I don't have OCD, I have CDO. It's the same, but with the letters in the correct order.