Hope you get this solved. Your WIP lot is absolutely wonderful @AbellaKellaher ! I'm going to be following the other thread so I can add it to my favs when you upload.
Regarding the pool bar and waterfall... I've had these items go dark on me a couple of times in the past. I noticed that this only happened when I placed my build on certain lots however. I was thinking perhaps the lot orientation or the water level in that area caused the glitch but who knows. To fix this issue I deleted pieces of the pool with the hammer until the object colours reappeared then redid the deleted areas. In one case I had to redo most of the pool before it fixed itself. Perhaps that method may work for you at least with the pool items. Good luck!
@skybaker , thanks for the great tip. Always something new to learn about MasterController.