After months finally I finished my coaster and I was taking the last screenshots to enter the Build It! competition right now. I closed the game for a while (about an hour) and now when I click on the RCT3 apps the application just flash one time in the dock bar and then nothing happens!

I'm a Mac user with OS X El Capitan installed

Someone else has the same problem?

Maybe it's due to the installation of some CS? But it's been a while since I installed the last one... I mean I installed the last CS days ago and than close and restart the game without any problems...

I'm really angry cause this has prevented me from entering this round of the competition and perhaps prevent me from playing forever!!   

Many thanks!

Almost same issue I have, mine goes until 60% prep loading is done every time then crashes. Probably bad CS in my case but I'm not sure with yours...

Since I've purchased my game online on the App Store, I've done the backup of all my saved files such as campaign, parks, coasters, laser/water shows etc... and all my CS, then I've uninstalled the game. I re-install the game just now and everything works. Now I'm gonna re-install the CS one by one and try the game. Maybe you can do the same Chris?

I plan on trying it, can't until Spring Break though :/

Keep holding on m8! 

I've reinstalled all my CS and everything works now! Just uninstalled and reinstalled the game