Hm....
it's possible that they've put some type of "coyping" protection on to LL since companies are figuring us out now. :)
Best thing I could advise is backing up your saved games and coaster designs, uninstalling rct completely, and re-installing from the original game, then to CF, then to LL.
Sorry but that's my best and only guess.
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www.angelfire.com/in3/rct