Line across screen when switching between applications?

2011 21.5" iMac OS X Mavericks (10.9)
AMD Radeon HD 6770M 512
Since upgrading to Mavericks I have noticed a line across the screen during the genie effect when you open, close or minimize applications. The line is most noticable when minimizing an application which is on top of my wallpaper. The wallpaper is the default Mavericks image.
The line does not appear when scrolling or sliding back through pages in safari etc. The above is the only thing that will trigger the issue.
Is anyone else experiencing this or have a solution for it?

Do you have any third-party extensions installed? I googled and found several that will perform this auto-hide action: Quitling, App Presto, AutoHide, and DragThing are some of them.

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Message was edited by: menavaur - Typos

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Line across screen when switching between applications?

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