Display Flashing on MacBook Pro

After upgrading to ML from SL on my mid-2010 MBP, there is a slow, but steady, flashing around the active window.  It doesn't matter whether I am using the integrated graphics or the discrete graphics.  Anyone else seeing this issue?

Well that is great news!
I'd look at any third party app that claims to theme your mac or change settings globally on it.
Something you might want to take a look at is: system preferences>users and groups>click your username in the list, and then click on the Login Items tab.
These applications run whenever you boot up, try unchecking some of them.
When uninstalling an application, make sure you uninstall it completely with app Zapper or an app like it that finds all the relevant hidden files throughout your system that is attributed to that application.
Glad I could help! The good news is, it doesn't sound like a hardware issue!!

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