Create A World Homes Covered in Terrain

I'm sorry, but I had some difficulty following this. Let me see if I understand correctly:

1. You were working on a world on one laptop.
2. You exported the world, added new lots to it, then exported to The Exchange.
3. On a second computer, you downloaded the world off the exchange to work on, but...
4. ...because you didn't have the actual CAW file itself, used the save file to add and edit lots, then saved them to library?
5. Then to re add from library in EIG, you created a new working CAW version of the world by importing the save game...
6. ...and now the lots from the library you added in EIG are green in this new world file?

In that case, this is such an obscure glitch stemming from this process of converting your save game into a CAW file that all I can do is provide a few stabs in the dark. Some ideas:

POTENTIAL SOLUTION (SIMPLE):

What happens if you redraw the lots in CAW? I would experiment with one lot. Take a lot with a "green house," redraw it in CAW, add the house from library, export and see what happens. From personal experience, I've had lots corrupt and the only solution was to redraw and readd lots from library. If the house shows up fine, then you'll have to do this with all of the borked builds. It's painstaking if you have a million lots but if you have a morning to spare, are desperate to save your work and have lots of coffee on hand, it's doable. 

POTENTIAL SOLUTIONS (NOT SO SIMPLE):

1. Delete all of your cache files in both your Sims 3 and CAW folders. Not just the usual ones everyone says to delete (socialCache.cache, Compositor.cache, blah blah blah) but inside of Electronic Arts\The Sims 3\WorldCaches and The Sims 3 Create A World Tool\WorldbuilderCache. You want to delete any file that references your world.
2. Resave your world in CAW as "AlryneValley1", then use that to resave back to Alryne Valley. Sometimes this can reset your world and clear up any glitches.
3. If worse comes to worse, factor reset /Sims 3 and /Create a World folders by pulling each of them to desktop, restarting Sims 3, restarting Create a World (to regenerate folders), then slowly adding back important folders from desktop. 

I think this is solvable, but like I said, a pretty obscure glitch that doesn't have an obvious solution, but these are what I generally do when a world becomes so borked and there isn't a ready made solution in fixing it.