Toddlers: game not working after installation [SOLVED]

Hello, I've installed the latest DLC, and now my game won't start. I have all the previous DLCs, including Fitness and Parenthood, and everything worked perfectly fine. Until now. 

When trying to open the game, it does nothing. Tried running it as an administrator, it briefly shows up on the taskbar and then it's gone again. No error messages, no nothing. 

At the game folder, inside Documents/Electronic Arts there are now 2 folders, one of them in Spanish. 

I uninstalled the game and reinstalled it again, following the instructions for every DLC and still, nothing.


****************UPDATE******************
I applied the solution from this post, and my game is now working!! 

To any admin who sees this post, you can close it. And thank you to the team for finding a quick solution to the problem!

The latest stuff pack is faulty! You will have to revert to fitness. That means re- installing everything. Remove your mods and tray and saves from your documents. always do that before installing new DLC in case something drastic happens