How to track down an app that is preventing my iMac from shutting down

Hello! I lately discovered that an application is preventing my iMac from shutting down . I have The Sims 3 installed on my computer but i don't think it's preventing my computer from shutting down.
So my question is, how can I find out what app is preventing my iMac from shutting down.

What's Keeping Me?
http://www.hamsoftengineering.com/products/wkm/wkm.html
Or open Terminal in Utilities and copy/paste this in. Then hit enter.
lsof -l +L -R -V | grep /

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