@CharlieP No, I build the Park myself when i was young and now i modify it. I don't remember what the bug caused though.
1. http://imgur.com/a/mRSIt
i can't delete the track piece by hand, only when i delete the whole coaster, the game crashes.
2. all signs are scattered through the park. They all "seem" to be the same sign, when i delete one, the game doesn't crash immediatly, only when i scroll over one of the others that are up. (kinda strange)
could it have a connection to the item limitation of signs? Because the park is huge and has many signs.