Whenever I make a roller coaster, just a basic one, and add custom scenery it works fine. Unless I go back to the menu, then whenever I load the map and try to add more custom scenery using the walls or the other buttons, I crash. No sid/svd error, just crash. It happens with everything custom thing I use. As soon as I go back to the menu or leave the game and go back to a map with custom scenery, it crashes when clicking on a scenery add button. I don't think anyone else has this issue. Its ridiculous. I've tried everything, I've double checked all my custom scenery folders and that it has both .ovl files and stuff. Anyone have any help?

re-download and re-install all your CS

So, I need to keep uninstalling and installing it every time?

doing it once should fix everything... providing you install it all correctly

I have, I have done that many times. I have quadruple checked everything right. It doesn't work, I don't think my games loads the scenery right.

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New issue: when I load the map, it auto crashes as soon as finished loading.

have you tried uninstalling the game? if you have, it could be a faulty set that is messing up everything