I had stopped playing rct3 for a while and now I started to play i had to re-install the game again so i knew i needed to get some custom scenery. I downloaded a bunch of supports, stations, lasers etc. Once i finally put them in my game i saw them all there except the original structures that came with the game were all gone. Actually the rides cant have entrances so no peeps can ride them, there are no fireworks, water lasers, or lasers to place in the game (not the effects but the object the effect shoots out of) just the laser dome i recently downloaded. The scenery objects plants and path objects and stuff all gone. I see all the stuff that is gone in the files but it doesn't show up in the game. I have no clue what is causing my problem but i know it has something to do with the CS (custom scenery) Please help!!!!!!!!!!!!!!!

That's what happened to me once, I just had to deal with it, and eventually reinstalled RCT3. You can try downloading shyguys circus center set, which comes with an invisible entrance. I use that all the time anyway. I have no clue what causes it. Sorry that happened to you.