Really cool lot, and especially the terrain is well painted and crafted...

With this, it seems the terrain paint/ground-cover problem is not well fixed still even after NL patch or OFB
Anyay, if the approach, adding the removed terrain paints BEFORE a new installtion of the lot, still does not work, Duds, may try to re-export another complete copy out of your game (Before the exportation, ensure the presence of all the terrain paints that had been in the game while you had been making the lot). May clean it with the Clean-installer BUT necessarily leave the terrain paints/ground-covers alone along with the shared or back-up copy...

Hopefully, it's not too late yet...

Added:
May also get some of the updated uploads on your first post, so new downloaders can get them together...

For further infos, may check back your thread,
Flashing terrain in downloaded lots
http://www.modthesims2.com/showthread.php?p=1123927