Ringworlds and Map Editor

[Fyron]

I am trying to start my PBW game (Adamant 003), which will have everyone start on a Ringworld. The editor won't let me change them to anything but Rock/None. I know I have done this before, and it worked then. I can't get it to work now. Can anybody give me some help? This is for SEIV 1.49, btw.

Here's what I did:
1) Created customs systems and quadrant in data files.
2) Generated the map in SEIV, cause the map editor likes crashing itself when I try to do this in it.
3) Located suitable starting locations for each empire, and placed starting locations so that it would take less time later.
4) Deleted the star at the 1st starting location.
5) Placed a Ringworld, and set the type/atmosphere to the correct values (such as Ice/Oxygen).
6) Checked the Ringworld to make sure I did it right. The type was Rock/None.

I won't post the map file, due to security reasons. Here are the data files I edited:
Data.zip