RCT3 Issues

For some reason, I cannot see my parks I make. Nothing! Only shadows and people. If I zoom away from my park, I can't see the coaster tracks, supports, or anything, except the peeps sitting in the trains. And when I use CoasterCam, I can only see the track two feet infront of me. Is there a way to fix this? It is really bothering me, because after I build a really good custom coaster, I want to see what it looks like, not just its shadow.

Any ideas?