I have reported the second part (the part you edited) at https://bugs.launchpad.net/widelands/+bug/1235382, it seems to be a update problem (the icons do not get updated when terrain is changed).
I cannot reproduce the first part though. At the very point of "The Maze v1.1", I have the three port spaces available (to set in the editor), one is enabled. In the game, I can build a port there (I use r6785). It is unrelated to the bug I reported at Launchpad.